The army of Alsace, formed in the aftermath of the defeat at Mulhouse, finally received its commander, General Paul Pau, mutilated veteran of the Franco-Prussian war. The same day, the 13th of August, the army of Alsace launched an attack on the village of Montreux-Vieux and its surroundings. Montreux-Vieux became the first Alsacian village to be taken by the French army.
The German government’s idea was to make the people think that they were entering a defensive war and were in no way the aggressors. With the assassination of Archduke Franz-Ferdinand, the Austro-Hungarian Empire engaged the hostilities.