Reconnaissance flights and landing operation in World War I| OKWAVE

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A preparatory bombardment began at 2:12 a.m. on 3 July, against the same targets as 1 July but with the addition of the artillery of the 19th Division. Assembly trenches had been dug, which reduced the width of no man's land from 800–500 yards (730–460 m) at its widest. Two brigades of the 12th Division attacked at 3:15 a.m., with the left covered by a smoke-screen. Red rockets were fired immediately by the Germans and answered by field and heavy artillery barrages on the British assembly, front line and communication trenches, most of which were empty as the British infantry had moved swiftly across no man's land. The four attacking battalions found enough gaps in the German wire, to enter the front trench and press on to the support (third) trench but German infantry "pour[ed]" out of dug-outs in the first line, to counter-attack them from behind.

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After dawn, aerodromes were periodically to be attacked by small formations of low-flying fighters and by day bombers from high-altitude. German defensive preparations Main article: German defensive preparations: June–July 1917 From mid-1917, the area east of Ypres was defended by six German defensive positions the front position, Albrechtstellung (second position), Wilhemstellung (third position), Flandern I Stellung (fourth position), Flandern II Stellung (fifth position) and Flandern III Stellung (under construction). Between the German defence positions, lay the Belgian villages of Zonnebeke and Passchendaele. "Elastic" defence tactics had been rejected by the 4th Army Chief of Staff, Major-General Fritz von Loßberg, who believed that a tactical withdrawal by trench garrisons would disorganise the counter-attacking reserves, leading to the loss of the sector and danger to flanking units. Loßberg ordered the front line of sentry groups (Postengraben) to be held rigidly; British attacks would exhaust themselves and then be repulsed by local German reserves or by Eingreif divisions. Loßberg also judged that there was little prospect of British attacks being delayed by their need to move artillery forward and build supply routes. The British had a huge mass of artillery and the infrastructure necessary to supply it with ammunition, much of it built opposite the Flandern I Stellung in the period between the attack at Messines and 31 July. German defensive tactics had been costly but succeeded on the front of XIX Corps on 31 July and against II Corps on the Gheluvelt Plateau on 31 July and during August, although the counter-attacks had been stopped in their turn by British artillery fire, when they reached areas where observation and communications between British infantry and artillery had been restored. Ludendorff later wrote that losses in the August battles had been unexpectedly high. The pause in British operations in early September helped to mislead the Germans. General von Kuhl (Chief of Staff, Army Group Crown Prince Rupprecht) doubted that the offensive had ended but by 13 September had changed his mind.

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The German defensive success on the Gheluvelt Plateau left the British in the centre open to enfilade-fire from the right, that contributed to the higher number of losses after the advance had stopped and Gough was criticised for setting objectives that were too ambitious, causing the infantry to lose the barrage and become vulnerable to the German afternoon counter-attacks. Prior and Wilson wrote that the failure had deeper roots, since successive attacks could only be spasmodic, as guns were moved forward, a long process that would only recover the ground lost in 1915. This was far less than the results Haig had used to justify the offensive, in which great blows would be struck, the German defences would collapse and the British would be able safely to advance beyond the range of supporting artillery to the Passchendaele and Klercken ridges, towards Roulers and Thourout and the Belgian coast. The German counter-bombardments and Eingreif divisions had not crumpled, leaving only the possibility of a slow tactical success, rather than a strategic triumph. In 2008, Harris called the attack on 31 July a remarkable success compared to 1 July 1916, with only about half the casualties and far fewer fatalities, inflicting about the same number on the Germans, prisoner interrogations convincing Haig that the German army had deteriorated. The relative failure on the Gheluvelt Plateau and the repulse in the centre from the red line and parts of the green line by German counter-attacks did not detract from this, other counter-attacks being defeated. Had the weather been dry during August the German defence might have collapsed and the geographical objective of the offensive, to re-capture the Belgian coast might have been achieved. Much rain fell on the afternoon of 31 July and the rain in August was unusually severe, having a worse effect on the British, who had more artillery and a greater need to get artillery-observation aircraft into action in the conditions of rain and low cloud. Mud paralysed manoeuvre and the Germans were trying to hold ground rather than advance, that was an easier task regardless of the weather.

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The "barrage line" was patrolled all day for the week before the attack, by fighters at 15,000 feet (4,600 m) with more at 12,000 feet (3,700 m) in the centre of the attack front. No British corps aircraft were shot down by German aircraft until 7 June, when 29 corps aircraft were able to direct artillery fire simultaneously over the three attacking corps. Behind the barrage line lay a second line of defence, which used wireless interception to take bearings on German artillery observation aircraft and guide British aircraft into areas where German flights were most frequent. By June 1917, each British army had a control post of two aeroplane compass stations and an aeroplane intercepting station, linked by telephone to the army wing headquarters, fighter squadrons, the anti-aircraft commander and the corps heavy artillery headquarters. The new anti-aircraft communication links allowed areas threatened by German bombardment to be warned, German artillery spotting aircraft to be attacked and German artillery batteries to be fired on when they revealed themselves. From 1–7 June, II Brigade had 47 calls through wireless interception, shot down one German aircraft, damaged seven and stopped 22 German artillery bombardments. Normal offensive patrols continued beyond the barrage line out to a line from Ypres to Roulers and Menin, where large formations of British and German aircraft clashed in long dogfights, once German air reinforcements began operating in the area. Longer-range bombing and reconnaissance flights concentrated on German-occupied airfields and railway stations and the night bombing specialists of 100 Squadron attacked trains around Lille, Courtrai, Roulers and Comines.

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On 14–15 July the 18th Division had cleared Trônes Wood to the south and had established a line up to Maltz Horn Farm, adjacent to the French 153rd Division. At 12:35 a.m. Lukin was ordered to capture the north-west part of Delville Wood at all costs and then to advance westwards to meet the 27th Brigade, as it attacked north and north–eastwards through Longueval. The advance began on 16 July at 10:00 a.m. but the casualties of the South Africans had reduced the weight of the attack, which was repulsed by the German defenders. The 27th Brigade advance were pinned down in the village by machine-gun fire from an orchard in the north end of Longueval.

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In the early afternoon a German counter-attack at the junction of the Entente armies on the Steenbeek was repulsed. The position gained by the French was not easily defensible, consisting of craters half-full of water, which dissolved into rivulets when connected. Contact with the rear was difficult to maintain over the moonscape of shell-holes, many of them wide and of great depth but the French infantry had been issued supplies for four days to minimise the difficulty. The German 2nd Guard Reserve Division advanced through Houthoulst Forest towards the junction of the Fifth and French First armies but the attack bogged down in deep mud. A prisoner said that in his company of about 150 men, barely fifty reached attacking distance and most of those took cover in shell-holes. The first four days of August were exceptionally rainy, which added to the difficulty of maintaining troops in the ground captured on 31 July. On 4 August despite the mud, the First Army advanced east of Kortekeer Kabaret and took two farms west of the road from Woumen to Steenstraat. On 26 July 37 British fighters engaged fifty Albatros scouts near Polygon Wood. During the mêlée, four German reconnaissance aircraft were able to slip over the line and reconnoitre. Next evening eight British aircraft over Menin lured about twenty Albatros scouts to Polygon Wood, where 59 British fighters were waiting. Allied and German aircraft in the vicinity joined in the dogfight and after an hour the surviving German aircraft withdrew. The British decoys shot down six German aircraft and the ambushers another three while the British lost two aircraft. On 27 July a British reconnaissance aircraft detected an apparent German tactical withdrawal, which enabled XIV Corps to occupy 3,000 yards (2,700 m) of the German front line. Next day the fine weather allowed the British to conduct a large amount of air observation for counter-battery fire and to detect numerous German batteries which had been moved. By 31 July, the Allied air concentration from the Lys River to the sea consisted of 840 aircraft, 330 being fighter aircraft.

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The Battle of Polygon Wood took place during the second phase of the Third Battle of Ypres in World War I and was fought near Ypres in Belgium 26 September – 3 October 1917, in the area from the Menin Road to Polygon Wood and thence north, to the area beyond St Julien. Much of the woodland had been destroyed by the huge quantity of shellfire from both sides since 16 July and the area had changed hands several times. General Herbert Plumer continued the series of British general attacks with limited objectives. The British attacks were led by lines of skirmishers, followed by small infantry columns organised in depth, (a formation which had been adopted by the Fifth Army in August) with a vastly increased amount of artillery support, the infantry advancing behind five layers of creeping bombardment on the Second Army front. The advance was planned to cover 1,000–1,500 yd (910–1,370 m) and stop on reverse slopes which were easier to defend, enclosing ground which gave observation of German reinforcement routes and counter-attack assembly areas. Preparations were then made swiftly to defeat German counter-attacks, by mopping-up and consolidating the captured ground with defences in depth. The attack inflicted a severe blow on the German 4th Army, causing many losses, capturing a significant portion of the Flandern I Stellung, which threatened the German hold on Broodseinde ridge. The better weather continued to benefit the British attackers by drying the ground, raising mist which obscured British infantry attacks made around dawn, then clearing to reveal German Eingreif formations to air and ground observation, well in advance of their arrival on the battlefield. German defensive arrangements were changed hastily after the battle to try to counter British offensive superiority. The Battle of Polygon Wood ポリゴンの森の戦い

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The 6th Army attacked with the XIV, VII, XIII and XIX corps, intending to break through the Allied defences from Arras to La Bassée and Armentières. German infantry advanced in rushes of men in skirmish lines, covered by machine-gun fire. To the south of the 18th Brigade, a battalion of the 16th Brigade had dug in east of Radinghem while the other three dug a reserve line from Bois Blancs to Le Quesne, La Houssoie and Rue du Bois, half way to Bois Grenier. A German attack by the 51st Infantry Brigade at 1:00 p.m. was repulsed but the battalion fell back to the eastern edge of the village, when the German attack further north at Ennetières succeeded. The main German attack was towards a salient at Ennetières held by the 18th Brigade, in disconnected positions held by advanced guards, ready for a resumption of the British advance. The brigade held a front of about 3 mi (4.8 km) with three battalions and was attacked on the right flank where the villages of Ennetières and La Vallée merged. The German attack was repulsed by small-arms fire and little ground was gained by the Germans, who were attacking across open country with little cover. Another attack was made on Ennetières at 1:00 p.m. and repulsed but on the extreme right of the brigade, five platoons were spread across 1,500 yd (1,400 m) to the junction with the 16th Brigade. The platoons had good observation to their fronts but were not in view of each other and in a drizzle of rain, the Germans attacked again at 3:00 p.m. The German attack was repulsed with reinforcements and German artillery began a bombardment of the Brigade positions from the north-east until dark, then sent about three battalions of the 52nd Infantry Brigade of the 25th Reserve Division forward in the dark, to rush the British positions. The German attack broke through and two companies of Reserve Infantry Regiment 125 entered Ennetières from the west; four companies of Reserve Infantry Regiment 122 and a battalion of Reserve Infantry Regiment 125 broke in from the south and the British platoons were surrounded and captured. Another attack from the east, led to the British infantry east of the village retiring to the west side of the village, where they were surprised and captured by German troops advancing from La Vallée, which had fallen after 6:00 p.m. and who had been thought to be British reinforcements; some of the surrounded troops fought on until 5:15 a.m. next morning. The German infantry did not exploit the success and British troops on the northern flank were able to withdraw to a line 1 mi (1.6 km) west of Prémesques, between La Vallée and Chateau d'Hancardry.

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Six more German aircraft were shot down by RFC and Royal Naval Air Service ("RNAS") pilots over the battlefield. Operations further afield were reduced due to the low cloud but three German airfields were attacked and an offensive patrol over the front line intercepted German bombers and escorts and drove them off. German 4th Army Despite difficulties at the extremities of the attack front, by mid-morning most British objectives had been gained and consolidated. The Germans launched several counter-attacks, with the Eingreif divisions supported by the equivalent of ten normal divisional artilleries. Clearing weather assisted early observation of the German counter-attacks, most of which were repulsed by accurate and heavy artillery and small-arms fire, causing many German casualties. At Zonnebeke a local counter-attack by the 34th Fusilier Regiment (3rd Reserve Division) was attempted around 6:45 a.m., with part of the 2nd battalion (in support) advancing to reinforce the 3rd Battalion holding the front line and the reserve battalion (1st) joining the counter-attack, after advancing west over Broodseinde ridge. The order reached the troops south of the Ypres–Roulers railway quickly, who attacked immediately. The companies south of Zonnebeke advanced and were overrun by British troops on the Grote Molen spur and taken prisoner. Closer to the railway, troops reached the lake near Zonnebeke church and were pinned down by a British machine-gun already dug-in nearby. The counter-attack order was delayed north of the railway and the counter-attack there did not begin until the 1st Battalion (in reserve) arrived. The battalion was able to descend the slope from Broodseinde covered by mist and smoke, which led to few losses but some units losing direction. The British barrage near the village caused many casualties but the survivors pressed on through it and at 7:30 a.m. reached the remnants of the 3rd Battalion near the level crossing north of the village, just in time to hold off a renewed British attack 200 yd (180 m) short of their position, as stray German troops trickled in.

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On the 8th Division front, the two attacking brigades started well, advancing behind an "admirable" barrage and reached the Hanebeek, where hand bridges were used to cross and continue the advance up Anzac Spur, to the green line objectives on the ridge beyond. Difficulties began on the left flank, where troops from 16th Division had not kept up with the 8th Division. After reaching the vicinity of Potsdam Redoubt a little later, the 16th Division was held up for the rest of the day. The check to the 16thn Division, left German machine-gunners north of the railway free to enfilade the area of 8th Division to the south. On the right flank, the same thing happened to the 56th Division, which was stopped by fire from German strong-points and pillboxes in their area and from German artillery concentrated to the south-east. After a long fight, the 8th Division captured Iron Cross, Anzac and Zonnebeke redoubts on the rise beyond the Hanebeek, then sent parties over the ridge. XIX Corps had the same difficulties as II Corps in preparing its attack by the 16th and 36th divisions, from north of the Ypres–Roulers railway to just south of St. Julien. The divisions were to advance 1 mi (1.6 km) up Anzac and Zonnebeke spurs, near the Wilhelm (third) line. Providing carrying parties since the last week in July and holding ground from 4 August, in the Hanebeek and Steenbeek valleys, which were overlooked by the Germans had exhausted many men. From 1–15 August, the divisions had lost about a third of their front-line strength in casualties. Frequent relief during the unexpected delays caused by the rain, spread the casualties to all of the battalions in both divisions. The advance began on time and after a few hundred yards encountered German strong points, which were found not to have been destroyed by a series of special heavy artillery bombardments, fired before the attack. The 16th Division had many casualties from the Germans in Potsdam, Vampire and Borry farms, which had not been properly mopped up, because the infantry shortage was so serious.

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The precedent of a German withdrawal to a prepared position followed by a counter-attack, which had occurred in 1914 was noted and that reserves freed by the retirement, would give the Germans an opportunity to attack the flanks of the withdrawal area. Nivelle had already decided to use the French troops released by the shorter front to reinforce the line in Champagne. British preparations for the attack at Arras were to proceed, with a watch kept for a possible German attack in Flanders and preparations for the attack on Messines Ridge were to continue. The pursuit of the German army was to be made in the Fourth Army area with advanced guards covered by the cavalry and cyclists attached to each corps and the 5th Cavalry Division. Larger forces were not to move east of a line from the Canal du Nord to the Somme south of Péronne until roads, bridges and railways had been repaired. The boundary of the Fourth Army and French Third Army was set from south of Nesle, through Offroy to St. Quentin.

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British artillery fired a preparatory bombardment from Polygon Wood to Langemarck but the German guns concentrated on the Gheluvelt Plateau. The British artillery was hampered by low cloud and rain, which made air observation extremely difficult and shells were wasted on empty gun emplacements. The British 25th Division, 18th Division and the German 54th Division took over by 4 August but the German 52nd Reserve Division was not relieved; both sides was exhausted by 10 August. The 18th Division attacked on the right and some troops quickly reached their objectives but German artillery isolated the infantry around Inverness Copse and Glencorse Wood. German troops counter-attacked several times and by nightfall the copse and all but the north-west corner of Glencorse Wood had been recaptured. The 25th Division on the left flank advanced quickly and reached its objectives by 5:30 a.m., rushing the Germans in Westhoek but snipers and attacks by German aircraft caused an increasing number of casualties. The Germans counter-attacked into the night as the British artillery bombarded German troops in their assembly positions. The appalling weather and costly defeats began a slump in British infantry morale; lack of replacements concerned the German commanders. Plan of attack Ypres area, 1917 The attack was planned as an advance in stages, to keep the infantry well under the protection of the field artillery. II Corps was to reach the green line of 31 July, an advance of about 1,480–1,640 yd (1,350–1,500 m) and form a defensive flank from Stirling Castle to Black Watch Corner. The deeper objective was compensated for by reducing battalion frontages from 383–246 yd (350–225 m) and leap-frogging supporting battalions through an intermediate line, to take the final objective. On the 56th Division front, the final objective was about 550 yd (500 m) into Polygon Wood. On the right, the 53rd brigade was to advance from Stirling Castle, through Inverness Copse to Black Watch Corner, at the south western corner of Polygon Wood, to form a defensive flank to the south.

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Under Plan XVII, the French peacetime army was to form five field armies of c. 2,000,000 men, with groups of Reserve divisions attached to each army and a group of reserve divisions on the flanks. The armies were to concentrate opposite the German frontier around Épinal, Nancy and Verdun–Mezières, with an army in reserve around Ste. Ménéhould and Commercy. Since 1871, railway building had given the French General staff sixteen lines to the German frontier against thirteen available to the German army and the French could wait until German intentions were clear. The French deployment was intended to be ready for a German offensive in Lorraine or through Belgium. It was anticipated that the Germans would use reserve troops but also expected that a large German army would be mobilised on the border with Russia, leaving the western army with sufficient troops only to advance through Belgium, south of the Meuse and the Sambre rivers. French intelligence had obtained a 1905 map exercise of the German general staff, in which German troops had gone no further north than Namur and assumed that plans to besiege Belgian forts were a defensive measure against the Belgian army.

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The increased amount of heavy artillery was to be used to destroy German concrete shelters and machine-gun nests, which were more numerous in German "battle zones", than the "outpost zones" which had been captured in July and August and to engage in more counter-battery fire. Few German concrete pill-boxes and machine gun nests had been destroyed during earlier preparatory bombardments and attempts at precision bombardment between attacks had also failed. The 112 heavy and 210 field guns and howitzers in the Second Army on 31 July, were increased to 575 heavy and medium and 720 field guns and howitzers for the battle, which was equivalent to one artillery piece for every 5 ft (1.5 m) of the attack front and more than double the density in the Battle of Pilckem Ridge. Plumer's tactical refinements sought to undermine the German defence by making a shallower penetration and then fighting the principal battle against German counter-attack (Eingreif) divisions. By further reorganising infantry reserves, Plumer ensured that the depth of the attacking divisions roughly corresponded to the depth of local German counter-attack reserves and their Eingreif divisions. More infantry was provided for the later stages of the advance, to defeat German counter-attacks, by advancing no more than 1,500 yd (1,400 m) before consolidating their position. When the Germans counter-attacked they would encounter a British defence-in-depth, protected by artillery and suffer heavy casualties to little effect, rather than the small and disorganised groups of British infantry that the Germans had driven back to the black line on the XIX Corps front on 31 July. Minor operations During a lull in early September, both sides tried to improve their positions; on 1 September, a determined German attack at Inverness Copse was repulsed. Further north in the XIX Corps area, a battalion of the 61st Division rushed Hill 35 but only took a small area; another attempt on 3 September failed.

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The fighting and retirements in the face of unceasing pressure by the 2nd Army led the right of the Third Army to give up ground as it tried to maintain contact with the left flank of Fifth Army. First Battle of Bapaume, 24–25 March Day 4, 24 Marc In the late evening of 24 March, after enduring unceasing shelling, Bapaume was evacuated and then occupied by German forces on the following day.[62] The British official historian, Brigadier-General Sir James E. Edmonds wrote, The whole of the Third Army had swung back, pivoting on its left, so that, although the VI and XVII Corps were little behind their positions of the 21st March, the right of V Corps had retired seventeen miles [27 km]. The new line, consisting partly of old trenches and partly shallow ones dug by the men themselves, started at Curlu on the Somme and ran past places well known in the battle of the Somme, the Bazentins and High Wood, and then extended due north to Arras. It was, for the most part, continuous, but broken and irregular in the centre where some parts were in advance of others; and there were actually many gaps...Further, the men of the right and centre corps..were almost exhausted owing to hunger and prolonged lack of sleep." After three days the infantry was exhausted and the advance bogged down, as it became increasingly difficult to move artillery and supplies over the Somme battlefield of 1916 and the wasteland of the 1917 German retreat to the Hindenburg Line. German troops had also examined abandoned British supply dumps which caused some despondency, when German troops found out that the Allies had plenty of food despite the U-boat campaign, with luxuries such as chocolate and even Champagne falling into their hands. Fresh British troops had been hurried into the region and were moved towards the vital rail centre of Amiens. The German breakthrough had occurred just to the north of the boundary between the French and British armies. The new focus of the German attack came close to splitting the British and French armies. As the British were forced further west, the need for French reinforcements became increasingly urgent.

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There were three phases to the bombardment: a brief fire on command and communications, then a destructive counter-battery bombardment and then bombardment of front-line positions. The deep bombardment aimed to knock out the opponent's ability to respond; it lasted only a few hours to retain surprise, before the infantry attacked behind a creeping barrage. Such artillery tactics had been made possible by the vast numbers of accurate heavy guns and large stocks of ammunition that Germany had deployed on the Western Front by 1918. An officer of the 51st (Highland) Division wrote, "The year 1917 ... closed in an atmosphere of depression. Most divisions on the Western front had been engaged continuously in offensive operations ... all were exhausted ... and weakened." The last German offensive on the Western Front, before the Cambrai Gegenschlag (counter-stroke) of December 1917, had been against the French at Verdun, giving the British commanders little experience in defence. The development of a deep defence system of zones and trench lines by the Germans during 1917, had led the British to adopt a similar system of defence in depth. This reduced the proportion of troops in the front line, which was lightly held by snipers, patrols and machine-gun posts and concentrated reserves and supply dumps to the rear, away from German artillery. British divisions arranged their nine infantry battalions in the forward and battle zones according to local conditions and the views of commanders; about 1⁄3 of the infantry battalions of the Fifth Army and a similar number in the Third Army held the forward zone. The Forward Zone was organised in three lines to a depth depending on the local terrain. The first two lines were not held continuously, particularly in the Fifth Army area, where they were in isolated outpost groups in front of an irregular line of supporting posts. The third line was a series of small redoubts for two or four platoons. Posts and redoubts were sited so that intervening ground could be swept by machine-gun and rifle-fire or from machine-guns adjacent to the redoubts. Defence of the Forward Zone depended on fire-power rather than large numbers of troops but in the Fifth Army area a lack of troops meant that the zone was too weak to be able to repulse a large attack.

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Casualties in the 33rd Division were so great that it was relieved on 27 September by the 23rd Division, which had only been withdrawn on the night of 24/25 September. Battle of Polygon Wood　ポリゴンの森の戦い Australian infantry with small box respirator gas masks, Ypres, September 1917 The Second Army altered its Corps frontages soon after the attack of 20 September, for the next effort (26 September – 3 October) so that each attacking division could be concentrated on a 1,000 yards (910 m) front. Roads and light railways were extended to the new front line, to allow artillery and ammunition to be moved forward. The artillery of VIII Corps and IX Corps on the southern flank, simulated preparations for attacks on Zandvoorde and Warneton. At 5.50 a.m. on 26 September, five layers of barrage fired by British artillery and machine-guns began. Dust and smoke thickened the morning mist and the infantry advanced using compass bearings. Each of the three German ground-holding divisions attacked on 26 September, had an Eingreif division in support, twice the ratio of 20 September. No ground captured by the British was lost and German counter-attacks managed only to reach ground to which survivors of the front-line divisions had retired. Battle of Broodseinde ブルードサインデの戦い The Battle of Broodseinde (4 October), was the last assault launched by Plumer in good weather. The operation aimed to complete the capture of the Gheluvelt Plateau and occupy Broodseinde Ridge. The Germans sought to recapture their defences around Zonnebeke, with a methodical counter-attack also to begin on 4 October. The British attacked along a 14,000 yards (13,000 m) front and by coincidence, Australian troops from I Anzac Corps met attacking troops from the German 45th Reserve Division in no man's land when Operation Hohensturm commenced simultaneously. The Germans had reinforced their front line to delay the British capture of their forward positions, until Eingreif divisions could intervene, which put more German troops into the area most vulnerable to British artillery. The British inflicted devastating casualties on the 4th Army divisions opposite.

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The advance began on 16 July at 10:00 a.m. but the casualties of the South Africans had reduced the weight of the attack, which was repulsed by the German defenders. The 27th Brigade advance were pinned down in the village by machine-gun fire from an orchard in the north end of Longueval. The survivors fell back to their trenches midway in the wood and were bombarded for the rest of the day. The situation became desperate and was made worse by an attack by Thuringian Infantry Regiment 153.

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The bulk of the British Expeditionary Force (BEF) was transported to France between 12 and 21 August, protected by British destroyers and submarines patrolling Heligoland Bight, which German ships would have to cross if they sortied. The Grand Fleet remained in the centre of the North Sea ready to move south but no attack came. The German army had anticipated a rapid transfer of the British army to France, German naval planners overestimated the time the British would need and German submarines were on patrol seeking the Home Fleet. At Harwich, Commodore Roger Keyes commanded a squadron of long-range submarines that regularly patrolled the Heligoland Bight and Commodore Reginald Tyrwhitt commanded a destroyer patrol. They observed that German destroyers had adopted a regular pattern of patrols where each evening cruisers would escort destroyers out of harbour, to patrol for British ships during the night before being met and escorted home each morning. Keyes and Tyrwhitt proposed to send a superior force during darkness to ambush the German destroyers as they returned. Three British submarines would surface in a position to draw the destroyers back out to sea while a larger British force of 31 destroyers accompanied by nine submarines would cut them off from Germany. Other submarines would wait for any larger German ships leaving the Jade estuary to help. Keyes impressed First Lord of the Admiralty Winston Churchill by the daring of his plan, which was adopted with some changes. An attack at 08:00 on the German daytime patrol was preferred. Keyes and Tyrwhitt requested support for their operation, in particular bringing the Grand Fleet south and the support of the squadron of six light cruisers commanded by Commodore William Goodenough. This was refused by the Chief of Staff—Vice Admiral Doveton Sturdee—who instead agreed to place only lighter forces consisting of Cruiser Force K (Rear Admiral Gordon Moore) with the battlecruisers HMS New Zealand and Invincible 40 mi (35 nmi; 64 km) to the north-west and Cruiser Force C comprising the Cressy-class armoured cruisers, HMS Cressy, Aboukir, Bacchante, Hogue and Euryalus, 100 mi (87 nmi; 160 km) west. The attack was planned for 28 August; the submarines were to sail on 26 August, while Keyes would travel on the destroyer Lurcher and the surface ships would depart at dawn on 27 August. Tyrwhitt, aboard the brand new light cruiser HMS Arethusa, would command the 3rd Flotilla of 16 modern L-class destroyers, whilst his subordinate, Captain William Blunt, aboard the light cruiser HMS Fearless, would command the 1st Flotilla of 16 older destroyers. Tyrwhitt had requested the replacement of his cruiser HMS Amethyst because she was too slow to keep up with his destroyers but Arethusa did not arrive until 26 August. Her crew were inexperienced and it was discovered that its new 4 in (100 mm) Mk V guns jammed when fired.

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Additional German reinforcements began arriving and by late evening portions of the 111th Infantry Division occupied the third line near Acheville and Arleux, with the remainder of the division arriving the following day. The British moved three fresh brigades up to the Red Line by 9:30 am on 10 April to support the advance of the 1st and 2nd Canadian Division, whereupon they were to leapfrog existing units occupying the Red line and advance to the Blue Line. Fresh units including two sections of tanks and the 13th British Brigade were called up from reserve to support the advance of the 2nd Canadian Division. By approximately 11:00 am, the Blue Line, including Hill 135 and the town of Thélus, had been captured. To permit the troops time to consolidate the Blue Line, the advance halted and the barrage remained stationary for 90 minutes while machine guns were brought forward. Shortly before 1:00 pm, the advance recommenced with both the 1st and 2nd Canadian Divisions reporting their final objective.The tank supported advance via Farbus, and directed at the rear of the 79th Reserve Division, was eventually halted by concentrated German fire short of the village.

Reconnaissance flights and landing operation in World War I

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和訳をお願いします。

和訳をお願いします。

和訳をお願いします。

和訳をお願いします。

和訳をお願いします。

和訳をお願いします。

和訳をお願いします。

和訳をお願いします。

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