In 1956, George F. Kennan claimed that the Sisson Documents were forgeries in an article. The arguments were largely technical, "ranging from the use of suspicious letterheads and seals, to language discrepancies, to the presence of defunct dating systems..., to apparently forged signatures, and... evidence that the same typewriter had been used to prepare... documents emanating from different offices." Kennan also mentioned logistic arguments. Kennan noted that it was possible the Bolsheviks "received clandestine subsidies from German sources during the summer and early autumn of 1917," but that it wouldn't have followed after the "November Revolution", when the "disintegration of the Russian armed forces–was now an accomplished fact." By this time the Bolsheviks had their own funding sources, and Kennan argued the projected German aid wouldn't have led to any subservience on the part of the Bolsheviks.