After a short period in reserve the Division was moved, between 6th and 8th September, to join the XIV Corps, Fourth Army (Lt.-Gen. Lord Cavan), to which corps it had for some time belonged up north. The XIV Corps was the right corps of the British attack, and had its right on the north bank of the Somme. In a succession of hard-fought battles the Fourth Army (Gen. Sir H. S. Rawlinson) had pushed the Germans back a considerable distance; units were feeling the strain badly, and fresh troops were needed. On 9th September a successful attack had given us Ginchy and Leuze Wood, but the Germans were holding very strongly the high ground which lies in the form of a horseshoe between the above-named points, and which dominates the country for some distance to the south. The trenches followed the shape of the spur roughly at the back end of the horseshoe, and covered access was given to them by a sunken road leading back to the deep valley which runs north from Combles. At the top of the spur, just south of the railway and communicating with the sunken road, was a four-sided trench in the form of a parallelogram of some 300 yards by 150 yards, called by us the Quadrilateral. It was this strong point and the adjoining trenches which had held up the advance of the Fourth Army on the 9th September, and it was the first task of the 6th Division to obliterate the horseshoe and straighten the line preparatory to a general attack on the 15th September. On 12th September attacks by the 56th Division on the south and the Guards on the north reduced the neck of the horseshoe, or pocket, to about 500 yards, but could not close it. The situation within the horseshoe was undefined, and the exact positions of the Quadrilateral and other trenches were not known, owing to the bad flying weather. Even our own positions were in doubt, as almost every vestige of roads, railways and even villages had disappeared under the continuous bombardments. On night 11/12th September the 71st Infantry Brigade (Brig.-Gen. J. F. Edwards) relieved part of the Guards Division and the 16th Infantry Brigade (Brig.-Gen. W. L. Osborn), part of the 56th Division, with orders on the 13th September to straighten the line by capturing the Quadrilateral. The 71st Infantry Brigade attacked with the Foresters north of the railway and 9th Suffolk Regiment south of the railway, while the 8th Bedford Regiment, who were close to the Quadrilateral on the north-east of the Leuze Wood, co-operated by bombing up the trench towards it. The artillery co-operation was weak, observation being difficult, and though the troops advanced with the greatest gallantry the northern attack could only make 500 yards, and the southern attack of the 71st Infantry Brigade still less, while casualties from the enemy artillery and machine-gun fire were very large.