On 31 August the group began moving to Rembercourt Aerodrome, a new airfield in the Saint-Mihiel sector. On 12 September the Saint-Mihiel Offensive started. The group was given orders to fly low and attack enemy targets on the ground, a very dangerous mission that exposed the pilots to ground fire. A number of the pilots became experts in balloon strafing, and Lt Luke of the 27th shot down fifteen enemy balloons in seventeen days. During the offensive, the group began patrols before daybreak, and kept up a constant barrage each day until after dark at night. Patrols were constantly engaging in low-level aerial battles with enemy reconnaissance and large formations of Fokker pursuit aircraft. The group kept up an incessant barrage over and above the ground forces and claimed thirty-four victories while losing one pilot.