 The following day in the same vicinity, he claimed a Messerschmitt Bf 109.As the Battle of France opened on 10 May, Clisby began to score heavily, estimates for his remarkable run of "kills" in the next five days ranging from eight to thirteen or more.Clisby destroyed two Dornier Do 17 bombers on 10 May, after which his aircraft was struck by friendly fire from a French anti-aircraft battery.