In the afternoon of October 1, 1916, the British troops assaulted the double-trench system of the main German third line over a front of about 3,000 yards from beyond Le Sars to a point 1,000 yards or so east of Eaucourt l'Abbaye. The British troops in the center, directly in front of Eaucourt l'Abbaye, were held up by the complicated defenses there, but the troops on the right, carrying everything before them, swept over the main lines of trench east of the place until well beyond it they occupied positions on the north, which they held against all German assaults. The center was meanwhile reenforced by the arrival of "tanks," which accomplished useful work in clearing the trenches; these were then occupied by the British troops. On October 2, 1916, German forces succeeded in pressing through a gap in the British line, and again occupied trenches before the village, while the British continued to hold their positions on the farther side, some of which were a thousand yards to the rear of the enemy. The following day the British heavily bombarded Eaucourt l'Abbaye and drew the cordon tighter around it. October 4, 1916, they assumed the offensive, and driving the Germans out of their trenches, filled up the gap and entered the town. Eaucourt l'Abbaye, with its old monastic buildings furnished with immense cellars, crypts and vaults, offered admirable conditions for prolonged defense. More important than the occupation of this place was the capture by the British of the positions around it with over 3,000 yards of the long-prepared German third line. These gains were won by the British troops at considerable cost in casualties, while the Germans also lost heavily.
The important part played by the "tanks" in this successful operation is worthy of record. One of these machines becoming disabled, continued for some time to operate as a stationary fortress. Later the "tank" became untenable and the crew were forced to abandon it. While this was being done the commanding officer of the "tank" was somewhat severely wounded so that he could not proceed. Two unwounded members of the crew refused to leave the wounded officer, and for more than two days they stayed with him in a shell hole between the lines. While hiding in this dangerous position the wounded officer was again struck by a bullet, but it was found impossible to get him away until the British captured the positions around the town.