The Battle of France led to the collapse of the French army after a period of flight.
Battle of France . German forces occupied Paris unopposed on 14 June after a chaotic period of flight of the French government that led to a collapse of the French army . The Battle of Mulhouse ( Mülhausen ) , also called the Battle of Alsace ( Bataille d'Alsace ) , which began on 7 August 1914 , was the opening attack of World War I by the French Army against Germany .