text: Second phase After the territorial gains of the first two days, a lull followed as British guns, ammunition and transport links were moved forward. Battalions of pioneers built temporary roads across the churned up battlefield; heavy artillery (and its ammunition) was manhandled into position in new gun pits; food for the men and feed for the draught horses was brought up and Casualty Clearing Stations were established in readiness for the inevitable counter-attacks. Allied commanders also faced a dilemma: whether to keep their exhausted divisions on the attack and run the risk of having insufficient manpower or replace them with fresh divisions and lose momentum.
  The news of the battle reached General Ludendorff during his 52nd birthday celebrations at his headquarters in Kreuznach who wrote, "I had looked forward to the expected offensive with confidence and was now deeply depressed". He telephoned each of his commanders and "gained the impression that the principles laid down by OHL were sound but the whole art of leadership lies in applying them correctly". (A later court of inquiry found that Falkenhausen had indeed misunderstood the principles of defence in depth.) Ludendorff immediately ordered reinforcements. On 11 April, he sacked Falkenhausen's chief of staff and replaced him with Loßberg. Loßberg went armed with  (the right to issue orders in the army commander's name) and within hours, Loßberg began to restructure the German defence. The British aimed to consolidate the gains made in the first days of the offensive, to keep the initiative and to break through in concert with the French at Aisne. From 16 April, it was apparent that the French part of the Nivelle Offensive on the Aisne had not achieved a breakthrough. Haig continued to attack at Arras, to divert troops from the French on the Aisne.
  Second Battle of the Scarpe (23–24 April 1917)