The Ulm Campaign in October 1805 was catastrophic for Austria , with only the corps of Michael von Kienmayer and Franz Jellacic escaping Escaping envelopment Besieging and capture Conquering by the Grande Armée of Napoleon .

While Kienmayer 's troops withdrew Escaping east toward Vienna , the only escape Escaping route open Openness to Jellacic was to the south .

The 1805 war Hostile_encounter began Process_start with the Ulm Campaign Military_operation which was disastrous Catastrophe for Austria , with only the corps of Michael von Kienmayer and Franz Jellacic escaping Escaping envelopment Besieging by the Grande Armée of Napoleon .

As Kienmayer 's columns fled Escaping to the east , they joined Cause_to_amalgamate with elements of the Russian Empire 's army in a rear guard action at the Battle Hostile_encounter of Amstetten on 5 November .