According to
Harold Hartney's autobiography, on 18 September 1918, after Wehner and Luke flamed their second balloon, six Fokkers dived on Luke. Wehner saw them first and fired a Very pistol to warn Luke but apparantly Luke didn't see it. As Wehner intercepted the six Fokkers, a seventh Fokker came from above and shot him down. Luke proceeded to down two of the Fokkers, but broke off when he ran low on fuel. Returning to the aerodrome, he spotted friendly archie fire indicating enemy planes in the area. Luke arrived on the scene and found three French planes maneuvering for position with two German planes. Streaking past the French, he shot down one of the German planes. Totals: 3 planes for Luke and 2 balloons shared with Wehner.