 The first book he published in the new decade was his official history of Canada's participation in World War I, released in 1962.In the introduction to the 2015 reissue of the book, Mark Osborne Humphries notes, "[b]etween 1918 and 1962, there were three abortive attempts to write Canada's official history of the Great War, but successive historians found it impossible to escape backroom intriguing, personal rivalries, and funding cuts.