In October 1915 following an unsuccessful French offensive and the entry of Bulgaria, Briand again became Prime Minister (29 October 1915), succeeding René Viviani. He also became Foreign Minister for the first time, a post held by Théophile Delcassé until the final weeks of the previous government. He was also pledged to "unité de front", not just between the military and Parliament but also closer links with the other Allies, a pledge met with "prolonged, thunderous applause" by the deputies.