From 1912 to 1914 he was chief of staff to Joseph Joffre and helped to develop the strategic Plan XVII for the recapture of Alsace-Lorraine as part of an invasion of Germany.
Édouard de Castelnau, francoski general in politik, * 24. december 1851, Saint-Affrique, † 19. marec 1941, Montastruc-la-Conseillère.