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The Battle of Langemarck took place from 21–24 October, after an advance by the German 4th and 6th armies which began on 19 October, as the left flank of the BEF began advancing towards Menin and Roulers. On 20 October, Langemarck, north-east of Ypres, was held by a French territorial unit and the British IV corps to the south. I Corps (Lieutenant-General Douglas Haig) was due to arrive with orders to attack on 21 October. On 21 October, it had been cloudy and attempts to reconnoitre the German positions during the afternoon had not observed any German troops movements; the arrival of four new German reserve corps was discovered by prisoner statements, wireless interception and the increasing power of German attacks; 5
1⁄2 infantry corps were now known to be north of the Lys, along with the four cavalry corps, against 7
1⁄3 British divisions and five allied cavalry divisions. The British attack made early progress but the 4th army began a series of attacks, albeit badly organised and poorly supported. The German 6th and 4th armies attacked from Armentières to Messines and Langemarck. The British IV Corps was attacked around Langemarck, where the 7th Division was able to repulse German attacks and I Corps was able to make a short advance.
Further north, French cavalry was pushed back to the Yser by the XXIII Reserve Corps and by nightfall was dug in from the junction with the British at Steenstraat to the vicinity of Dixmude, the boundary with the Belgian army. The British closed the gap with a small number of reinforcements and on 23 October, the French IX Corps took over the north end of the Ypres salient, relieving I Corps with the 17th Division. Kortekeer Cabaret was recaptured by the 1st Division and the 2nd Division was relieved. Next day, I Corps had been relieved and the 7th Division lost Polygon Wood temporarily. The left flank of the 7th Division was taken over by the 2nd Division, which joined in the counter-attack of the French IX Corps on the northern flank towards Roulers and Thourout, as the fighting further north on the Yser impeded German attacks around Ypres. German attacks were made on the right flank of the 7th Division at Gheluvelt. The British sent the remains of I Corps to reinforce IV Corps. German attacks from 25–26 October were made further south, against the 7th Division on the Menin Road and on 26 October part of the line crumbled until reserves were scraped up to block the gap and avoid a rout.
Langemarck ランゲマルク