“The four days ending September 4th, spent in the trenches, were characterized by a continual enemy bombardment that did not abate for a single instant. The enemy had registered on our trenches with light, as well as medium and heavy, batteries, notwithstanding that he had no direct observation from his trenches, which lie on the other side of the summit. His registering was done by his excellent air service, which renders perfect reports of everything observed.

“During the first day, for instance, whenever the slightest movement was visible in our trenches during the presence, as is usually the case, of enemy aircraft flying as low as three and four hundred yards, a heavy bombardment of the particular section took place. The very heavy losses during the first day brought about the resolution to evacuate the trenches during the daytime. Only a small garrison was left, the remainder withdrawing to a part of the line on the left of the Martinpuich⁠–⁠Pozières road.