Nivelle Offensive and the Importance of Flanders to the British Government| OKWAVE

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The effectiveness of the British mines, barrages and bombardments was improved by advances in artillery survey, flash-spotting and centralised control of artillery from the Second Army headquarters. British attacks from 8–14 June advanced the front line beyond the former German Sehnen (Oosttaverne) line. The Battle of Messines was a prelude to the much larger Third Battle of Ypres campaign, the preliminary bombardment for which began on 11 July 1917.In 1916, the British planned to clear the German army from the Belgian coast to prevent them from using the coastal ports as bases from which to attack merchant ships and troop transports in the North Sea and English Channel. In January 1916, General Sir Herbert Plumer recommended to Field Marshal Sir Douglas Haig the capture of Messines Ridge (part of the southern arc of the Ypres Salient) before an operation to capture the Gheluvelt plateau further north. The Flanders campaign was postponed because of the Battle of Verdun in 1916 and the demands of the Battle of the Somme. When it became apparent that the Second Battle of the Aisne (Nivelle Offensive) (16 April – 9 May 1917) had failed to achieve its most ambitious objectives, Haig instructed the Second Army to capture the Messines–Wytschaete Ridge as soon as possible. Haig intended to force the Germans to move troops away from the French armies on the Aisne front, where demoralisation amid the failure of the Nivelle Offensive had led to mutinies. British operations in Flanders would relieve pressure on the French Army and the capture of Messines Ridge would give the British control of the strategically important ground on the southern flank of the Ypres Salient, shorten the front, deprive the Germans of observation over British positions further north.

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As the infantry advanced over the far edge of the ridge, German artillery and machine-guns east of the ridge began to fire and the British artillery was less able to suppress them. Fighting continued on the lower slopes on the east side of the ridge until 14 June. The offensive removed the Germans from the dominating ground on the southern face of the Ypres salient, which the 4th Army had held since the First Battle of Ypres (19 October – 22 November 1914). The Russian army launched the Kerensky Offensive to honour the agreement struck with its allies, at the Chantilly meeting of 15–16 November 1916. After a brief period of success from 1–19 July, the German strategic reserve of six divisions, captured Riga from 1–5 September 1917. In Operation Albion (September–October 1917), the Germans took the islands at the mouth of the Gulf of Riga and the British and French commanders on the Western Front, had to reckon on the German western army (Westheer) being strengthened by reinforcements from the Eastern Front, in late 1917. Haig wished to exploit the diversion of German forces in Russia for as long as it continued and urged that the maximum amount of manpower and munitions be committed to the battle in Flanders. Haig selected Gough to command the offensive on 30 April and on 10 June, Gough took over the Ypres salient north of Messines Ridge. Gough planned an offensive based on the GHQ 1917 plan and the instructions he had received from Haig. On the understanding that Haig wanted a more ambitious version, Gough held meetings with his corps commanders on 6 and 16 June, where the third objective, which included the Wilhelm Stellung (third line), a second-day objective in earlier plans, was added to the two objectives due to be taken on the first day. A fourth objective was also given for the first day but was only to be attempted at the discretion of divisional and corps commanders, in places where the German defence had collapsed.

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This suggestion was opposed by the French and Italian delegations and the British General Staff, at least covertly and was discarded. The new French Commander-in-Chief, Robert Nivelle, believed that a concentrated attack by French forces on the Western Front during the spring of 1917, could break the German front and lead to a decisive victory. The Nivelle plan was welcomed by the British, despite many in the Cabinet and War Office being sceptical, because a French attack would mean a lesser burden falling on the British. Haig was ordered to co-operate with Nivelle but secured French agreement that in the event the offensive failed, the British would attack in Flanders with French support. On 9 April, British and Empire forces undertook a preliminary attack at the Battle of Arras and the Nivelle Offensive began on 16 April. The French attack gained ground at great cost but no breakthrough leading to open warfare and the decisive defeat of the German army occurred, leading to Nivelle being replaced by Philippe Petain, a collapse in morale and mutinies in the French armies. While the French recuperated, offensive action on the Western Front could only come from the BEF. It was not until June 1917 that the principle of a Flanders campaign was approved by the British Cabinet and more grudgingly by the Prime Minister, against his preference for an Italian campaign. Haig ordered General Herbert Plumer, the commander of the Second Army which occupied the Ypres Salient, to produce a plan in late 1916. Haig was dissatisfied with the limited scope of Plumer's plan for the capture of Messines Ridge and Pilkem Ridge – the name used in military circles for the higher ground around the small hamlet of Pilckem (Pilkem), within the dorp (village) of Boesinghe (Flemish: Boezinge). By early 1917, Haig felt that Nivelle's ambitious attempt at a decisive battle would either force the Germans to abandon the Belgian coast or that the German 4th Army in Flanders, would have divisions taken away to replace losses further south.

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In January 1917, the Second Army (II Anzac, IX, X and VIII corps) held the line in Flanders from Laventie to Boesinghe with eleven divisions and up to two in reserve. There was much trench mortaring, mining and raiding by both sides and from January to May, the Second Army had 20,000 casualties. In May, reinforcements began moving to Flanders from the south; the II Corps headquarters and 17 divisions had arrived by the end of the month. In January 1916, General Herbert Plumer, the Second Army commander, began to plan offensives against Messines Ridge, Lille and Houthulst Forest. General Henry Rawlinson was also ordered to plan an attack from the Ypres Salient on 4 February; planning continued but the Battle of Verdun and the Battle of the Somme took up the rest of the year. At meetings in November 1916, Haig, the French commander-in-chief Joseph Joffre and the other Allies met at Chantilly. The commanders agreed on a strategy of simultaneous attacks to overwhelm the Central Powers on the Western, Eastern and Italian fronts, by the first fortnight of February 1917. A meeting in London of the Admiralty and the General Staff urged that the Flanders operation be undertaken in 1917 and Joffre replied on 8 December, agreeing to a Flanders campaign after the spring offensive. The plan for a year of attrition offensives on the Western Front, with the main effort to be made in the summer by the BEF, was scrapped by the new French Commander-in-Chief Robert Nivelle. Nivelle planned an operation in three parts, with preliminary offensives to pin German reserves by the British at Arras and the French between the Somme and the Oise, then a French breakthrough offensive on the Aisne, followed by pursuit and exploitation. The plan was welcomed by Haig with reservations, which he addressed on 6 January.

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The British would gain observation of the southern slope of Menin Ridge at the west end of the Gheluvelt plateau, ready for a larger offensive in the Ypres Salient. The front line around Ypres had changed relatively little since the end of the Second Battle of Ypres (22 April – 25 May 1915). The British held the city, while the Germans held the high ground of the Messines–Wytschaete Ridge to the south, the lower ridges to the east and the flat ground to the north. The Ypres front was a salient bulging into the German lines but was overlooked by German artillery observers on the higher ground. The British had little ground observation of the German rear areas and valleys east of the ridges. The ridges ran north and east from Messines, 264 feet (80 m) above sea-level at its highest point, past "Clapham Junction" at the west end of the Gheluvelt plateau, 2.5 miles (4.0 km) from Ypres at 213 feet (65 m) and Gheluvelt which was above 164 feet (50 m) to Passchendaele, 5.5 miles (8.9 km) from Ypres at 164 feet (50 m) above sea-level, declining from there to a plain further north. Gradients varied from negligible, to 1:60 at Hooge and 1:33 at Zonnebeke. Underneath the soil was London clay, sand and silt. Since the First Battle of Ypres in 1914, much of the drainage in the area had been destroyed by artillery-fire, although some repairs had been achieved by army Land Drainage Companies brought from England. The area was considered by the British to be drier than Loos, Givenchy and Plugstreet Wood further south.

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— Griffith In August 1917, 127 mm (5.0 in) of rain fell, 84 mm (3.3 in) on 1, 8, 14, 26 and 27 August; the weather was also overcast and windless, which much reduced evaporation. Divided into two ten-day and an eleven-day period, there were 53.6, 32.4 and 41.3 mm (2.11, 1.28 and 1.63 in) of rain that August. In the 61 hours before 6:00 p.m. on 31 July, 12.5 mm (0.49 in) of rain fell and from 6:00 p.m. on 31 July to 6:00 p.m. on 4 August, there was 63 mm (2.5 in) of rain. There were three dry days and 14 days with less than 1 mm (0.039 in) of rain during the month. Three days were sunless and one had six minutes of sun; over 27 days there were 178.1 hours of sunshine, an average of 6.6 hours per day. The weather in August 1917 was exceptionally bad and Haig had been justified in expecting that the weather would not impede offensive operations, because rain would have been dried by the expected summer sunshine and breezes. Petain had committed the French Second Army to an attack at Verdun in mid-July, in support of the operations in Flanders. The attack was delayed, partly due to the mutinies which had affected the French army after the failure of the Nivelle Offensive and also because of a German attack at Verdun from 28–29 June, which captured some of the ground intended as a jumping-off point for the French attack. A French counter-attack on 17 July re-captured the ground, the Germans regained it on 1 August, then took ground on the east bank on 16 August. The battle began on 20 August and by 9 September, had taken 10,000 prisoners. Fighting continued sporadically into October, adding to the German difficulties on the Western Front and elsewhere. Ludendorff wrote: On the left bank, close to the Meuse, one division had failed ... and yet both here and in Flanders everything possible had been done to avoid failure ... The French army was once more capable of the offensive. It had quickly overcome its depression. — Ludendorff: Memoirs yet there was no German counter-attack, because the local Eingreif divisions were in Flanders.

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Preparations for operations in Flanders began in 1915, with the doubling of the Hazebrouck–Ypres rail line and the building of a new line from Bergues–Proven which was doubled in early 1917. Progress on roads, rail lines, railheads and spurs in the Second Army zone was continuous and by mid-1917, gave the area the most efficient supply system of the BEF. Several plans and memoranda for a Flanders offensive were produced between January 1916 and May 1917, in which the writers tried to relate the offensive resources available to the terrain and the likely German defence. In early 1916, the importance of the capture of the Gheluvelt plateau for an advance further north was emphasised by Haig and the army commanders. On 14 February 1917, Colonel C. N. Macmullen of GHQ proposed that the plateau be taken by a mass tank attack, reducing the need for artillery; in April a reconnaissance by Captain G. le Q Martel found that the area was unsuitable for tanks. On 9 February, General Rawlinson, commander of the Fourth Army, suggested that Messines Ridge could be taken in one day and that the capture of the Gheluvelt plateau should be fundamental to the attack further north. He suggested that the southern attack from St. Yves to Mont Sorrel should come first and that Mont Sorrel to Steenstraat should be attacked within 48–72 hours. After discussions with Rawlinson and Plumer and the incorporation of Haig's changes, Macmullen submitted his memorandum on 14 February. With amendments the memorandum became the GHQ 1917 plan. A week after the Battle of Messines Ridge, Haig gave his objectives to his Army commanders: wearing out the enemy, securing the Belgian coast and connecting with the Dutch frontier by the capture of Passchendaele ridge, followed by an advance on Roulers and Operation Hush, an attack along the coast with an amphibious landing. If manpower and artillery were insufficient, only the first part of the plan might be fulfilled. On 30 April, Haig told Gough the Fifth Army commander, that he would lead the "Northern Operation" and the coastal force, although Cabinet approval for the offensive was not granted until 21 June.

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The mistaken bombardments of friendly troops ended late on 9 June, when the New Zealand, 16th (Irish) and 36th (Ulster) divisions were withdrawn into reserve and the normal corps organisation was restored; anticipated large German counter-attacks had not occurred. On 10 June, the attack down the Blauwepoortbeek began but met strong resistance from the fresh German 11th Division, brought in from Group Ypres. The 3rd Australian Division advanced 600 yards (550 m) either side the river Douve, consolidating their hold on a rise around Thatched Cottage, which secured the right flank of the new Messines position; early on 11 June, the Germans evacuated the Blauwepoortbeek sector. British observation from the Oosttaverne line proved to be poor, which led Plumer to order a further advance down the slope. On 14 June, the II Anzac Corps was to push forward on the right from Plugstreet Wood to Trois Tilleuls Farm and Hill 20 and another 1,000 yards (910 m) to the Gapaard spur and Ferme de la Croix. IX Corps was to take Joye Farm, the Wambeke hamlet and come level with the Australians at Delporte Farm; X Corps was to capture the Spoil Bank and the areas adjacent. The attack was forestalled by a German retirement on the night of 10/11 June and by 14 June, British advanced posts had been established without resistance. Meticulously planned and well executed, the assault secured its objectives in fewer than twelve hours. The combination of tactics devised on the Somme and at Arras, the use of mines, artillery survey, creeping barrages, tanks, aircraft and small-unit fire-and-movement tactics, created a measure of surprise and allowed the attacking infantry to advance by infiltration when confronted by intact defences. Well-organised mopping-up parties prevented by-passed German troops from firing on advanced troops from behind. The British took 7,354 prisoners, 48 guns, 218 machine-guns and 60 trench mortars. The offensive secured the southern end of the Ypres salient in preparation for the British "Northern Operation". Laffert, commander of Gruppe Wijtschate, was sacked two days after the battle. Haig had discussed the possibility of rapid exploitation of a victory at Messines with Plumer before the attack, arranging for II and VIII Corps to advance either side of Bellewaarde Lake, using some of the artillery from the Messines front, which Plumer considered would take three days to transfer. On 8 June, patrols on the II and VIII Corps fronts reported strong resistance, Haig urged Plumer to attack immediately and Plumer replied that it would still take three days to arrange. Haig transferred the two corps to the Fifth Army and that evening, gave instructions to Gough to plan the preliminary operation to capture the area around Stirling Castle. On 14 June, Gough announced that the operation would put his troops into a salient and that he wanted to take the area as part of the main offensive. On 13 June, German aircraft began daylight attacks on London and the south-east of England, leading to the diversion of British aircraft from the concentration of air forces for the "Northern Operation".

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The Battle of Passchendaele (Third Battle of Ypres, Flandernschlacht and Deuxième Bataille des Flandres) was a campaign of the First World War, fought by the Allies against the German Empire. The battle took place on the Western Front, from July to November 1917, for control of the ridges south and east of the Belgian city of Ypres in West Flanders, as part of a strategy decided by the Allies at conferences in November 1916 and May 1917. Passchendaele lay on the last ridge east of Ypres, 5 miles (8.0 km) from a railway junction at Roulers, which was vital to the supply system of the German 4th Army. The next stage of the Allied plan was an advance to Thourout–Couckelaere, to close the German-controlled railway running through Roulers and Thourout. Further operations and a British supporting attack along the Belgian coast from Nieuwpoort, combined with Operation Hush (an amphibious landing), were to have reached Bruges and then the Dutch frontier. The resistance of the 4th Army, unusually wet weather, the onset of winter and the diversion of British and French resources to Italy, following the Austro-German victory at the Battle of Caporetto (24 October – 19 November), enabled the Germans to avoid a general withdrawal, which had seemed inevitable in early October. The campaign ended in November, when the Canadian Corps captured Passchendaele, apart from local attacks in December and the new year. In 1918, the Battle of the Lys and the Fifth Battle of Ypres were fought before the Allies occupied the Belgian coast and reached the Dutch frontier. A campaign in Flanders was controversial in 1917 and has remained so. The British Prime Minister, David Lloyd George, opposed the offensive, as did General Ferdinand Foch the French Chief of the General Staff. Field Marshal Sir Douglas Haig, commanding the British Expeditionary Force (BEF), did not receive approval for the Flanders operation from the War Cabinet until 25 July. The Battle of Passchendaele Third Battle of Ypres, パッシェンデールの戦い（第三次イープルの戦い）

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Total British losses from January to March 1917 in France were given as 67,217, French losses given were 108,000 and German losses were 65,381. The first attack of the Nivelle Offensive by the British First and Third armies came at Arras, north of the Hindenburg Line on 9 April and inflicted a substantial defeat on the German 6th Army, which occupied obsolete defences on forward slopes. Vimy Ridge was captured and further south, the greatest depth of advance since trench-warfare began was achieved, surpassing the success of the French Sixth Army on 1 July 1916. German reinforcements were able to stabilise the front line, using both of the defensive methods endorsed in the new German training manual and the British continued the offensive, despite the difficulties of ground and German defensive tactics, in support of the French offensives further south and then to keep German troops in the area while the Messines Ridge attack was being prepared. German casualties were c. 85,000, against British losses of 117,066 for the Third and First armies.

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It was agreed in the London Convention of 16 January, that the French assault on the Aisne would begin in mid-April and that the British would make a diversionary attack in the Arras sector approximately one week prior. Three armies of Field Marshal Sir Douglas Haig, the commander of the British Expeditionary Force (BEF) were in the Arras sector, the Fifth Army (General Hubert Gough) in the south, the Third Army (General Edmund Allenby) in the centre and the First Army (General Henry Horne) in the north and the plan was devised by Allenby. In December 1916, the training manual SS 135 replaced SS 109 of 8 May 1916 and marked a significant step in the evolution of the British Expeditionary Force (BEF) into a homogeneous force, well adapted to its role on the Western Front. The duties of army, corps and divisions in planning attacks were standardised. Armies were to devise the plan and the principles of the artillery component. Corps were to allot tasks to divisions, which would then select objectives and devise infantry plans subject to corps approval.

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Gough wrote later On the V Corps front they launched no less than six counter-attacks.... Their losses were very heavy and we captured over 1,300 prisoners. — Hubert Gough The official historians of the Reichsarchiv wrote, The German Eingreifdivisionen, 16th Bavarian Division at Gheluwe, 236th Division at Moorslede and 234th Division at Oostniewkerke in the Flandern III Stellung were assembled at their stations at 8:00 a.m. in readiness to move.... In spite of this the counter-attacks did not take effect until the late afternoon; for the tremendous British barrage fire caused most serious loss of time and crippled the thrust power of the reserves. — Reichsarchiv By nightfall the Eingreifdivisionen had been defeated. Analysis In 1948, J. E. Edmonds, the British official historian, wrote that with the exception of the failure to capture Tower Hamlets, at the top of the Bassevillebeek Spur the objectives of the attack had been achieved and the changed tactics of the Germans confounded. The French and British public knew little of the success but the contending armies in Flanders were well aware of its significance. The British relieved many of the attacking divisions, whose troops reported, that if all attacks could be so well prepared, the troops would be content. On 20 September and the next few days of local fighting the German had been driven from the positions on the Gheluvelt Plateau that had been the site of the main defensive effort (Schwerpunkt) since July. On 21 September, Haig ordered the next attack of Plumer's scheme, to complete the capture of Polygon Wood and part of Zonnebeke. In 1996, Prior and Wilson wrote that the battle had been more costly relative to the ground gained on 31 July even with the artillery reinforcements and better weather that made British artillery-fire more accurate. The German artillery was still able to inflict casualties at a higher rate and the success on the Gheluvelt Plateau took less ground than on 31 July.

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Haig accepted the plan on 18 July, to go ahead on 8 August (the operation was postponed several times before it was cancelled). On 24 August, the 33rd Division raided German outposts on the Geleide Brook, killed "many" Germans and took nine prisoners, for a loss of one killed and sixteen wounded. Next day the Germans retaliated and recaptured the most easterly post and on 26 August, fired fifteen super-heavy shells into Nieuport, demolishing the 19th Brigade headquarters. The division was withdrawn from the coastal sector in early September. The presence of two British divisions in the coastal sector convinced the German commanders that the danger of a British coastal offensive remained. The best tidal conditions for a landing would occur again on 18 August and the Fifth Army made its second general attack at Ypres on 16 August at the Battle of Langemarck, partly to meet the postponed landing date but failed to advance far in the most vital sector, leading to another postponement to 6 September. At a meeting on 22 August, between Haig, Rawlinson and Bacon, three alternatives were discussed; another postponement of the coastal operation, conducting the operation independently or moving the divisions from XV Corps to the Fifth Army. Rawlinson favoured an independent operation, which he thought would get as far as Middelkirke and bring Ostend into artillery-range and make the Germans counter-attack, despite the pressure being exerted on them at Ypres. Bacon wanted the area between Westende and Middelkirke to be occupied so that 15-inch naval guns would be within range of Bruges 31,000 yards (28,000 m) away and Zeebrugge 34,000 yards (31,000 m) distant. The Zeebrugge–Bruges canal would also be in range and its locks could be destroyed.

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When the offensive failed, Falkenhayn ordered the capture of Ypres to gain a local advantage. By 18 November, the First Battle of Ypres ended in failure, at a cost of 160,000 German casualties. In December 1914, the British Admiralty began discussions with the War Office, for a combined operation to re-occupy the Belgian coast but eventually the British were obliged to participate in French offensives further south. Large British offensive operations in Flanders were not possible in 1915, due to the consequent lack of resources. The Germans conducted their own Flanders offensive at the Second Battle of Ypres (22 April – 15 May 1915), making the Ypres salient more costly to defend. Sir Douglas Haig succeeded Sir John French as Commander-in-Chief of the BEF on 19 December 1915. A week after his appointment, Haig met Vice-Admiral Sir Reginald Bacon, who emphasised the importance of obtaining control of the Belgian coast, to end the threat posed by German U-boats. Haig was sceptical of a coastal operation, believing that a landing from the sea would be far more difficult than anticipated and that an advance along the coast would require so much preparation, that the Germans would have ample warning. Haig preferred an advance from Ypres, to bypass the flooded area around the Yser and the coast, before a coastal attack (Operation Hush) was attempted, to clear the coast to the Dutch border. Minor operations took place in the Ypres salient in 1916, some being German initiatives to distract the Allies from the preparations for the offensive at Verdun and later attempts to divert Allied resources from the Battle of the Somme. Other operations were begun by the British to regain territory or to evict the Germans from ground overlooking their positions. Engagements took place on 12 February at Boesinghe and on 14 February at Hooge and Sanctuary Wood. There were actions from 14–15 February and 1–4 March at The Bluff, 27 March – 16 April at the St. Eloi Craters and the Battle of Mont Sorrel from 2–13 June.

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Visibility increased except for frequent ground fog around dawn, which helped conceal British infantry during the attack, before clearing to expose German troop movements to British observation and attack. The British infantry succeeded in capturing most of their objectives and then holding them against German counter-attacks, inflicting many casualties on the local German defenders and Eingreif divisions sent to reinforce them by massed artillery and small-arms fire. German defences on the Gheluvelt Plateau, which had been retained or quickly recaptured in July and August were lost and the British began a run of success which lasted into early October. Strategic background The Kerensky Offensive by Russia in July had accelerated the disintegration of the Russian Army, increasing the prospect of substantial German reinforcements for the Western Front. The French attack at Verdun in August had inflicted a defeat on the German 5th Army similar in extent to the defeat of the 4th Army in the Battle of Messines in June but morale in the French army was still poor. In reports to the War Cabinet on 21 August and 2 September, Sir Douglas Haig repeated his view that the British campaign at Ypres was necessary to shield the other armies of the alliance, regardless of the slow geographical progress being made in the unusually wet weather of August. Tactical developments The German 4th Army had defeated British attempts to advance to the black and green (second and third) lines set for 31 July in the centre of the battlefield and on the Gheluvelt Plateau on the southern flank, during the frequent weather interruptions in August. These defensive successes had been costly and by mid-August, German satisfaction at their defensive achievements was accompanied by concern at the extent of casualties. The rain, constant bombardments and British air attacks had also put great strain on the German defence between British attacks.

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The original Allied estimate of casualties on the Somme, made at the Chantilly Conference on 15 November 1916, was 485,000 British and French casualties and 630,000 German. A German officer wrote, Somme. The whole history of the world cannot contain a more ghastly word. — Friedrich Steinbrecher In 1931, Wendt published a comparison of German and British-French casualties which showed an average of 30 percent more Allied casualties to German losses on the Somme. In the first 1916 volume of the British Official History (1932), J. E. Edmonds wrote that comparisons of casualties were inexact, because of different methods of calculation by the belligerents but that British casualties were 419,654, from total British casualties in France in the period of 498,054, French Somme casualties were 194,451 and German casualties were c. 445,322, to which should be added 27 percent for woundings, which would have been counted as casualties using British criteria; Anglo-French casualties on the Somme were over 600,000 and German casualties were under 600,000.

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The Third Battle of Ypres became controversial while it was being fought and has remained so, with disputes about the predictability of the August deluges and for its mixed results, which in much of the writing in English, is blamed on misunderstandings between Gough and Haig and on faulty planning, rather than on the resilience of the German defence.Operations in Flanders, Belgium had been desired by the British Cabinet, Admiralty and War Office since 1914. Douglas Haig succeeded John French as Commander-in-Chief of the British Expeditionary Force on 19 December 1915. A week after his appointment, Haig met Vice-Admiral Reginald Bacon, who emphasised the importance of obtaining control of the Belgian coast, to end the threat from German naval forces based in Bruges. In January 1916, Haig ordered General Henry Rawlinson to plan an attack in the Ypres Salient. The need to support the French army during the Battle of Verdun 21 February – 18 December 1916 and the demands of the Somme battles 1 July – 18 November 1916, absorbed the British Expeditionary Force's offensive capacity for the rest of the year. On 22 November Haig, Chief of the Imperial General Staff William Robertson, First Sea Lord Admiral Henry Jackson and Dover Patrol commander Vice-Admiral Reginald Bacon, wrote to General Joffre urging that the Flanders operation be undertaken in 1917, which Joffre accepted.In late 1916 and early 1917, military leaders in Britain and France were optimistic that the casualties they had inflicted on the German army at the Battle of Verdun, the Battle of the Somme and on the Eastern Front had brought the German army close to exhaustion, although the effort had been immensely costly. At the conference in Chantilly in November 1916 and a series of subsequent meetings, the Entente agreed on an offensive strategy to overwhelm the Central Powers by means of simultaneous attacks on the Western, Eastern and Italian Fronts. The Prime Minister David Lloyd George, sought to limit British casualties and proposed an offensive on the Italian front. British and French artillery would be transferred to Italy to add weight to the offensive.

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The Battle of the Lys (7–29 April 1918), also known as the Lys Offensive, the Fourth Battle of Ypres, the Fourth Battle of Flanders and Operation Georgette (Portuguese: Batalha de La Lys and French: 3ème Bataille des Flandres), was part of the 1918 German offensive in Flanders during World War I, also known as the Spring Offensive. It was originally planned by General Ludendorff as Operation George but was reduced to Operation Georgette, with the objective of capturing Ypres, forcing the British forces back to the channel ports and out of the war. In planning, execution and effects, Georgette was similar to (although smaller than) Operation Michael, earlier in the Spring Offensive.The German attack zone was in Flanders, from about 10 kilometres (6.2 mi) east of Ypres in Belgium to 10 kilometres (6.2 mi) east of Béthune in France, about 40 kilometres (25 mi) south. The front line ran from north-north-east to south-south-west. The Lys River, running from south-west to north-east, crossed the front near Armentières in the middle of this zone. The front was held by the Belgian Army in the far north, by the British Second Army (under Plumer) in the north and centre and by the British First Army (under Horne) in the south. The German attacking forces were the Sixth Army in the south (under Ferdinand von Quast), and the Fourth Army in the north (under Sixt von Armin). Both armies included substantial numbers of the new stosstruppen, trained to lead attacks with the new stormtroop tactics. The British First Army was a relatively weak force; it included several worn-out formations that had been posted to a "quiet sector". This included two divisions of the Portuguese Expeditionary Corps, which were undermanned, lacked almost half of their officers, had very low morale and were set to be replaced the day of the German attack. The German plan was to break through the First Army, push the Second Army aside to the north, and drive west to the English Channel, cutting off British forces in France from their supply line which ran through the Channel ports of Calais, Dunkirk and Boulogne. Battle of Estaires (9–11 April) The German bombardment opened on the evening of 7 April, against the southern part of the Allied line between Armentières and Festubert. The barrage continued until dawn on 9 April. Operation Georgette ジョルジェット作戦

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Operation Michael was a major German military offensive during the First World War that began the Spring Offensive on 21 March 1918. It was launched from the Hindenburg Line, in the vicinity of Saint-Quentin, France. Its goal was to break through the Allied (Entente) lines and advance in a north-westerly direction to seize the Channel ports, which supplied the British Expeditionary Force (BEF) and to drive the BEF into the sea. Two days later General Ludendorff, the Chief of the German General Staff, changed his plan and pushed for an offensive due west, along the whole of the British front north of the River Somme. This was designed to separate the French and British Armies and crush the British forces by pushing them into the sea. The offensive ended at Villers-Bretonneux, to the east of the Allied communications centre at Amiens, where the Allies managed to halt the German advance; the German Armies had suffered many casualties and were unable to maintain supplies to the advancing troops. Much of the ground fought over was the wilderness left by the Battle of the Somme in 1916. The action was therefore officially named by the British Battles Nomenclature Committee as The First Battles of the Somme, 1918, whilst the French call it the Second Battle of Picardy (2ème Bataille de Picardie). The failure of the offensive marked the beginning of the end of the First World War for Germany. The arrival in France of large reinforcements from the United States replaced Entente casualties but the German Army was unable to recover from its losses before these reinforcements took the field. Operation Michael failed to achieve its objectives and the German advance was reversed during the Second Battle of the Somme, 1918 (21 August – 3 September) in the Allied Hundred Days Offensive. On 11 November 1917, the German High Command (Oberste Heeresleitung, OHL) discussed what they hoped would be a decisive offensive on the Western Front the following spring. Their target was the British Expeditionary Force (BEF), commanded by Field Marshal Sir Douglas Haig, which they believed had been exhausted by the battles in 1917 at Arras, Messines, Passchendaele and Cambrai. A decision to attack was taken by General Erich Ludendorff on 21 January 1918. At the start of 1918, the German people were close to starvation and growing tired of the war. Operation Michael ミヒャエル作戦

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However, from 16 April onwards, it was apparent that the Nivelle Offensive was failing and Haig came under pressure to keep the Germans occupied in the Arras sector to minimise French losses. At 04:45 on 23 April, following two days of poor visibility and freezing weather, British troops of the Third Army (VI and VII corps), attacked to the east along an approximate 9 mi (14 km) front from Croisilles to Gavrelle on both sides of the Scarpe. The 51st Division attacked on the northern side in heavy fighting on the western outskirts of Roeux Wood and the chemical works. On their left, the 37th Division, attacked the buildings west of Roeux Station and gained the line of their objectives on the western slopes of Greenland Hill, north of the railway. On the left of the main British attack the 63rd Division, made rapid progress against Gavrelle and secured the village. To the south of the Scarpe and east of Monchy-le-Preux the 29th Division gained the western slopes of the rising ground known as Infantry Hill. The Cojeul river marked a divisional boundary within the VI Corps. Guémappe on the north side of the river was the objective of the 15th Division, attacking east from Wancourt towards Vis-en-Artois.

Nivelle Offensive and the Importance of Flanders to the British Government

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