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The 6th Army line from La Bassée to Armentières and Menin, was ordered not to attack until the operations of the new 4th Army in Belgium had begun. Both armies attacked on 20 October, the XIV, VII, XIII and XIX corps of the 6th Army making a general attack from Arras to Armentières. Next day the northern corps of the 6th Army attacked from La Bassée to St Yves and gained little ground but prevented British and French troops from being moved north to Ypres and the Yser fronts. On 27 October, Falkenhayn ordered the 6th Army to move heavy artillery north for the maximum effort due on 29 October at Gheluvelt, to reduce its attacks on the southern flank against II and III corps and to cease offensive operations against the French further south. Armeegruppe von Fabeck was formed from XIII Corps and reinforcements from the armies around Verdun, which further depleted the 6th Army and ended the offensive from La Bassée north to the Lys. On 14 and 15 October, II Corps attacked on both sides of La Bassée Canal and German counter-attacks were made each night. The British managed short advances on the flanks, with help from French cavalry but lost 967 casualties. From 16 to 18 October, II Corps attacks pivoted on the right and the left flank advanced to Aubers, against German opposition at every ditch and bridge, which inflicted another thousand casualties. Givenchy was recaptured by the British on 16 October, Violaines was taken and a foothold established on Aubers Ridge on 17 October; French cavalry captured Fromelles. On 18 October, German resistance increased as the German XIII Corps arrived, reinforced the VII Corps and gradually forced the II Corps to a halt. On 19 October, British infantry and French cavalry captured Le Pilly (Herlies) but were forced to retire by German artillery-fire. The fresh German 13th Division and 14th Division arrived and began to counter-attack against all of the II Corps front. At the end of 20 October, the II Corps was ordered to dig in from the canal near Givenchy, to Violaines, Illies, Herlies and Riez, while offensive operations continued to the north. The countryside was flat, marshy and cut by many streams, which in many places made trench digging impractical, so breastworks built upwards were substituted, despite being conspicuous and easy to demolish with artillery-fire. (It was not until late October that the British received adequate supplies of sandbags and barbed wire.)The British field artillery was allotted to infantry brigades and the 60-pounders and howitzers were reserved for counter-battery fire. The decision to dig in narrowly forestalled a German counter-offensive which began on 20 October, mainly further north against the French XXI Corps and spread south on 21 October, to the 3rd Division area.
