The Fifth Corps, under General Shute, followed the curve of the River Ancre on a front of 9000 yards. It was poorly provided with guns as the Corps to the left required a concentration of artillery, and it had no tanks since the marshy valley and sluggish stream lay before it. The Thirty-eighth Welsh Division (Cubitt) lay on the right and Campbell's Twenty-first on the left, each of them with two brigades in front and one in reserve. The Seventeenth Division (Robertson) was in support. The problem in front of General Shute's Corps was a most difficult one. Before it lay this evil watercourse which had been flooded by the Germans and was 300 yards wide at one part. All bridges were gone, and the banks were low and boggy. The main stream was over six feet deep, and its channel could not be distinguished from the general flood. The whole morass was covered by a tangle of fallen trees, reeds, and artificial obstructions. To the east of the river ran high ground, strongly held and fortified, from Tara Hill above Albert to the Thiepval Height, south of Grandcourt. The west bank was so overlooked that no one could move unscathed. And yet it was clear that until this formidable obstacle was surmounted it was neither possible for Rawlinson to advance from Albert, nor for the Fourth Corps on the left to assault Miraumont. The movements of Shute's Corps on August 21 were preliminary to their real attack. On that date the Twenty-first Division advanced on the left {83} flank, in close touch with the Forty-second Division of the Fourth Corps. Beaucourt was taken in the movement. By this operation the Twenty-first Division reached a point where the flood was narrower at St. Pierre Divion, and here some bridges could be constructed and preparations made for the passage.