Hi,
Yes, "French Warbirds" was also written by Claude W. Sykes (aka 'Vigilant'). Sykes wasn't only a writer, he translated several wonderful German books into English form, including
Rudolf Stark's "Wings of War" and "Flying Section 17" and "Double-decker C.66" by Haupt Heydemarck. He was better than most "historians" writing in the 1930's.
"German Warbirds" still has its flaws and myths, but it is, as TomVrille says, a good read.
The same can be said for "French Warbirds". I have lent my copy out so I cannot refer to it, but it basically consists of anecdotal chapters about most of the better-known French fliers - Guynemer, Fonck, Garros, Navarre, one chapter on the Storks. He must have had access to some original French material somewhere, for he gives some information I haven't seen anywhere else. He does makes some mistakes, such as putting Nungesser in the "Storks" (he has a rather condescending attitude toward Nungesser, too), and the book - as we would expect - lacks much of the hard dates and detailed info we modern historians would like. But it is a good read for a lazy afternoon, and it was certainly well-intentioned.
Greg