De Havilland D.H.9s of C Flight, No. 47 Squadron, at Ekaterinodar airfield. Powered by disappointing Armstrong-Siddeley Puma engines, the D.H.9s were supplemented by 400-hp Liberty-engine D.H.9As to conduct bombing operations in support of White Russian forces. (Raymond Collishaw/Library and Archives of Canada/PA-203554)