The III Corps (Lt.-Gen. Sir W. Pulteney) was on the right, and consisted of the 12th, 20th, and 6th Divisions, which attacked in the order named. The left corps (IV) consisted of the 51st and 62nd Divisions. These covered the six miles with an average frontage of one and a half miles. The 6th Division attacked on the front Villers Plouich-Beaucamps, with the 71st Infantry Brigade (Brig.-Gen. P. W. Brown) on the left next to the 51st Division, the 16th Infantry Brigade (Brig.-Gen. H. A. Walker) on the right next to the 20th Division. These two brigades were to advance about 3,000 yards to the first objective (Ribecourt and spur to south-east of it), and another 1,000 yards to the second objective (support system). The 18th Infantry Brigade (Brig.-Gen. G. S. G. Craufurd) was ordered to advance through the 71st Infantry Brigade and secure the third objective about a mile farther on (Premy Chapel Ridge), throwing back a defensive flank towards Flesquieres for the further operations of the 51st Division on its left and securing the flank of the 29th Division on its right. The latter division passing through the right of the 6th Division and the left of the 20th Division, was charged with securing the crossings of the St. Quentin Canal at Marcoing and Masnieres and seizing the high ground at Rumilly, thus facilitating exploitation to the south-east, preventing a concentration against the widely stretched defensive flanks of the III Corps and threatening Cambrai. The Divisional Artillery was reinforced during the first part of the operations by the 17th Brigade of the 29th Division and the 181st Brigade of the 40th Division, as well as by two R.H.A. Brigades. Batteries moved into position and camouflaged their guns. No registration could, of course, take place, but long practice enabled the gunners to put down a very accurate barrage without this desideratum. Opposite the Division the Hindenburg Line commenced with an outpost line 750 yards distant on the left and 250 yards on the right. This was out of sight of our front trenches by reason of the curve of the ground. Half a mile behind this came the main system, consisting of two trenches 200 yards apart, the whole guarded by most formidable belts of wire about 150 yards in depth. The interval between outpost and main systems was sown with well-sighted and concealed machine gun positions. A mile farther on, and on the opposite side of the valley for the most part, ran the support system, similar to the main system. One and a half miles farther back again was the reserve system, of which only machine-gun dug-outs were completed, and a small amount of wire had been erected.