On August 12-18, 1918, French forces under General Humbert resumed the offensive between the Matz and Oise Rivers and a drive forward was made into the German lines. East and north of Gury good progress was recorded, increasing the menace to Lassigny two miles to the northeast. The French also advanced two kilometers north of Cambronne, and eastward in the valley of the Oise, owing to continued pressure, the Germans were forced out of their trenches to the west of Bailly. The Allied artillery had now fall control of the converging roads in and out of Noyon, near the southern end of the line, notably that running northward to Ham. Under these conditions any attempt of the enemy to carry out a retrograde movement was greatly hampered. August 13-14, 1918, the Germans began the evacuation of a five-mile front north of Albert, extending from Beaumont-Hamel northward through the villages of Serre and Puisieux-au-Mont to Bucquoy. On the French front the town of Ribécourt, six miles from Noyon and on the road to that city, was wrested from the Germans as the result of a further thrust between the Matz and Oise Rivers. General Humbert's advance had made the French position on the southern part of the Thiescourt plateau secure. The Germans now occupied Plemont, which they captured early in the June fighting, and reoccupied their old trenches, which were still organized with wire entanglements. Here as elsewhere the Germans had the advantage that they were falling back on their supplies while the French were forced to bring theirs up through a very difficult country. General Humbert and his men had been fighting now continuously for four days, a great part of the time in gas-drenched sectors and against strongly held positions which the Germans had deemed impregnable. The French now held possession of two important crests, Claude Farm and Ecouvillon, and were within a hundred yards of Le Monolithe, another high plateau commanding a wide sweep of territory to the north and east. All the German positions between the western outskirts of Bray and Etineham were captured by the Australians, giving the British control of the river banks southwest of Bray. The Australians after a hard and brilliant fight drove the enemy from the Cateau Wood.