Friction arose between de Gaulle and Pétain over "Le Soldat", a history of the French soldier which he had ghost-written and for which he wanted greater writing credit. He had written mainly historical material, but Pétain wanted to add a final chapter of his own thoughts. There was at least one stormy meeting late in 1926 after which de Gaulle was seen to emerge, white with anger, from Pétain's office. In October 1926 he returned to his duties with the Headquarters of the Army of the Rhine.