In early September, an evacuation was considered and the War Office agreed with Marshall, that British troops should be withdrawn. The Ottoman success had been costly and it was only after the arrival of reinforcements that the attack could be resumed on 14 September, a plan disclosed to the defenders by a deserter on 12 September. The Ottoman plan for the final assault on Baku, was for the 15th Infantry Division to attack from the north and the 5th Caucasian Infantry Division to attack from the west, with the main attack on the north-west corner of the Baku defence line. The attack began at along a road through Wolf's Gap in the ridge. In clouds and mist, the two British pilots strafed the Ottoman troops on the western slopes from low altitude and reported the progress of the attack. By the Ottomans were half-way from the ridge to the city and at the pilots were ordered to destroy the aircraft, since they were too badly damaged to risk flying. The RAF contingent abandoned the airfield under artillery fire, the pilots took a machine-gun, salvaged three cameras and the ground crews took another machine-gun and joined the infantry defending the north end of the field.