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The Belgian army retirement continued on 11 and 12 October, covered by cavalry, cyclists and motor machine-gun sections. On 14 October, the Belgian army began to dig in along the Yser, the 6th and 5th divisions to the north of French territorial divisions, assembled at Boesinghe, then northwards along the Yser canal to the Fusiliers Marins at Dixmude. The 4th, 1st and 2nd divisions prolonged the line north, with advanced posts at Beerst, Keyem, Schoore and Mannekensvere, about 1 mi (1.6 km) forward on the east bank. A bridgehead was also held near the coast around Lombartzyde and Westende, to cover Nieuport, with the 2nd Cavalry Division in reserve. On 18 October, the French 87th and 89th Territorial Infantry divisions took over the defence of the front line south of Fort Knokke from the 6th Belgian division, which is moved to the Yser Front. On 21 October, the hard-pressed Belgian Army was reinforced with the French 42nd Division under command of Paul François Grossetti.
The Allies assembled a naval force under the British Admiral Horace Hood with three monitors, HMS Severn, Humber and Mersey and assorted craft to provide heavy artillery support to the Allied defenders of the seaward flank.
The German forces comprised the newly organised 4th Army, commanded by the Albrecht Duke of Württemberg, with the III Reserve Corps from Antwerp and four new reserve corps from Germany, along with cavalry and heavy artillery units. It moved southwards from Bruges and Ostend in the direction of the Yser river, to take the line from Nieuwpoort to Ypres. Diksmuide was attacked on 16 October and defended by Belgian and French troops under Colonel Alphonse Jacques who would later be awarded the title "de Dixmude" for his role in the defence of the town. Despite heavy losses, the Belgians and French held the town. The press, politicians, literary figures and the military channelled public opinion, making out that the defence of the town was both strategic and heroic.
On 18 October the German offensive began and overran Allied troops from Nieuwpoort south to Arras. The objective was to defeat the Belgian and French armies and to deprive the British of access to Calais, Boulogne and Dunkirk. The III Reserve Corps attacked Belgian defences from Diksmuide to the sea, regardless of loss. The Germans captured advanced posts at Keiem, Schoore and part of Mannekensvere and reached the Yser, despite fire support from the Anglo-French flotilla, which bombarded German troops along the coast as far as Middelkerke. The 4th Ersatz Division was forbidden to cross the Yser at Nieuwpoort because of the shell-fire from the Allied ships.