The German armies lost much less ground and had fewer casualties in October than in September (the costliest month of the battle) but the proportion of casualties increased from of the Anglo-French total. Rain, fog and mud were lesser problems for the Germans, who had to carry supplies forward over a much narrower beaten zone and were being forced back onto undamaged ground. German bombardments on the few roads between the original front line and the line in October increased the difficulties of the British and French armies; the size and ambition of Anglo-French attacks was reduced progressively to local operations.