The 1805 war began with the Ulm Campaign which was disastrous for Austria, with only the corps of Michael von Kienmayer and Franz Jellacic escaping envelopment by the Grande Armée of Napoleon. As Kienmayer's columns fled to the east, they joined with elements of the Russian Empire's army in a rear guard action at the Battle of Amstetten on 5 November. A few days later, Davout's III Corps caught up with Merveldt's division at Mariazell. The Austrian soldiers, their morale shaken by continuous retreating, were routed after a brief struggle. On 12 November, Austria's capital Vienna fell to the French without a fight. The outcome of the war would be decided by the Battle of Austerlitz in early December.