The capture of Chaulnes further precipitated the German retreat north of the Avre River. The French engaged in close pursuit of the foe, whom they continued to harass with mustard-gas shells the Germans left behind, and which were being fired from German guns by French gunners. In the course of the night General Debeney's troops advanced four and a half miles, and by morning were on the outskirts of Nesle, close on the heels of the retreating foe. After the fall of Chaulnes, Gomiecourt to the north and Sept Fours and a score of other villages were captured. The territory abandoned by the Germans in the retreat presented scenes of desolation and ruin unsurpassed since the war began. The names of towns had no longer any significance but as geographical designations. As places of habitation they had ceased to exist, and even their sites were difficult to recognize. The cemeteries were blown up and ruined and the contents of the graves scattered. At Roye and other towns the Germans had carefully filled the ruins with mustard gas which for a time prevented the Allies from occupying these places. Croisilles, the strong German position to the north of Bapaume, which had long held out against British attacks, was captured by a flanking movement by Haig's men on August 27, 1918. Further gains were made at all points on the battle line between Bapaume and the river Scarpe. North of the Arras-Cambrai road the Canadians captured the villages of Boiry and Pelves. On the north bank of the Somme British troops occupied Curly and Hardecourt, and drove forward in the direction of Maurepas. South of the river, Australians in an advance of between four and five miles were on their way to the crossings of the Somme at Péronne and Brie, encountering hard resistance from the Germans as they pushed on. A large German force was brought up to attack the British positions east of Monchy. According to the statements of prisoners, some of the German companies at the last moment refused to fight, and the others were forced to go ahead without them. For tactical reasons the British withdrew a few hundred yards and then organized an attack that drove the Germans from the field, and they were seen no more that day. According to an eyewitness the ground in this region was in parts literally carpeted with bodies in field gray. The total captures of the Allies on the western front since July 18, 1918, were now over 120,000 prisoners and over 2,000 guns. The British captured between August 21, 1918, and August 26, 1918, more than 21,000 prisoners of all ranks, and their own losses in killed, wounded, and missing during this period was only slightly in excess of this number. Since August 8, 1918, the British captures exceeded 47,000 officers and men, and over 600 guns.