Linguists holding bullhorns hollered, “A bas les Boches! A bas les Marcon! Down with the Boches! Down with the Macaronis! Vive la France!” A mortar crew with the 18th Infantry fired a special shell the size of an ostrich egg. It soared 200 feet into the night, detonated with dazzling pyrotechnic sparkle, and unfurled an American flag, which floated to earth; given a clear target at last, French gunners replied with eager fire. “Okay, boys, it’s open season,” one battalion commander ordered. “Fire at will.”