 Despite the losses suffered by the RFC, the "Luftstreitkräfte" failed to prevent the British from carrying out its priority, air support of the army during the Battle of Arras with up-to-date aerial photographs and other reconnaissance information.German 6th Army commander General Ludwig von Falkenhausen was responsible for the Cambrai–Lille sector and commanded 20 divisions, plus reserves.Vimy Ridge itself was principally defended by the ad hoc formation based under I Bavarian Reserve Corps commander General der Infanterie Karl von Fasbender.