Claim: Frederick John Knowles (1895-1979) failed to achieved the rank of Corporal in the British Army, and had several areal victories between 12 December 1917 and 17 January 1918.
Evidence: Corporal Frederick John Knowles MM (born 1895 in Nairn, Moray, Scotland; died 1979) was a Scottish World War I flying ace credited with seven aerial victories. 
Corporal