Battle of The Somme - Attrition: August and September

Attrition: August and September

By the start of August, Haig had accepted that the prospect of achieving a breakthrough was now unlikely; the Germans had "recovered to a great extent from the disorganisation" of July. For the next six weeks, the British would engage in a series of small-scale actions in preparation for the next major push. On 29 August the German Chief of the General Staff, Erich Falkenhayn, was replaced by General Paul von Hindenburg, with General Erich Ludendorff as his deputy, but in effect the operational commander. The immediate effect of this change was the introduction of a new defensive doctrine. On 23 September the Germans began constructing the Siegfried Stellung, called the Hindenburg Line by the British.

On the Fourth Army's front, the struggle for High Wood, Delville Wood and the Switch Line dragged on. The boundary between the British and French armies lay south-east of Delville Wood, beyond the villages of Guillemont and Ginchy. Here the British line had not progressed significantly since the first day of the battle, and the two armies were in echelon, making progress impossible until the villages were captured. The first British effort to seize Guillemont on 8 August was a debacle. On 18 August a larger effort began, involving three British corps as well as the French, but it took until 3 September before Guillemont was in British hands. Attention now turned to Ginchy, which was captured by the British 16th (Irish) Division on 9 September. The French had also made progress, and once Ginchy fell, the two armies were linked near Combles.

The British now had an almost straight front line from near Mouquet Farm in the north-west to Combles in the south-east, providing a suitable jumping-off position for another large-scale attack. In 1916 a straight front was considered necessary to enable the supporting artillery to lay down an effective creeping barrage behind which the infantry could advance.

This intermediate phase of the Battle of the Somme had been costly for the Fourth Army, despite there being no major offensive. Between 15 July and 14 September (the eve of the next battle), the Fourth Army made around 90 attacks of battalion strength or more with only four being general attacks across the length of the army's five miles (8 km) of front. The result was 82,000 casualties and an advance of approximately 1,000 yards (910 m)—a performance even worse than on 1 July.