text: The following day, troops from the 56th (1/1st London) Division were able to force the Germans out of the village, although the  was not fully in British hands until a few days later. The British were able to consolidate these gains and push forward towards Monchy-le-Preux, although they suffered many casualties in fighting near the village. One reason for the success of the offensive in this sector was the failure of Falkenhausen to employ a defence in depth. In theory, an attacker would be allowed to make initial gains, thus stretching their lines of communication. Reserves held close to the battlefield would be committed once the initial advance had bogged down, before enemy reinforcements could be brought up. The defenders would thus be able to counter-attack and regain any lost territory. In this sector, Falkenhausen kept his reserve troops too far from the front and they were too late for a useful counter-attack on either 10 or 11 April.
  Battle of Vimy Ridge (9–12 April 1917)
  At roughly the same time, in perhaps the most carefully crafted portion of the entire offensive, the Canadian Corps launched an assault on Vimy Ridge. Advancing behind a creeping barrage and making heavy use of machine guns – eighty to each brigade, including one Lewis gun in each platoon – the corps was able to advance through about  of German defences and captured the crest of the ridge at about 13:00 on 10 April. Military historians have attributed the success of this attack to careful planning by Canadian Corps commander Julian Byng and his subordinate General Arthur Currie, constant training and the assignment of specific objectives to each platoon. By giving units specific goals, troops could continue the attack even if their officers were killed or communication broke down, thus bypassing two major problems of combat on the Western Front.  The Canadian troops could see the Germans in retreat across the Douai Plain away from the ridge. There was nevertheless an inflexibility to the plan which prevented the leading troops from continuing the advance and on 10 April the Germans began to stop the gaps with reserves.