In October of 1805 the towns and villages north and east of Ulm were the scene of heavy fighting between French and Austrian forces. The Austrian Army commanded by General Mack was initially deployed south of the Danube, with its left flank anchored on the fortified city of Ulm and the right flank at Rain, just south of Donauwörth. Napoleon's Grande Armée succeeded in turning the Austrian flank by crossing the Danube east of Ulm and placing itself in the enemy's rear. On 8 October Marshall Murat defeated an Austrian force at Wertingen, southwest of Rain. The following day, Marshall Ney attacked Günzburg from the North and captured the bridges across the Danube.
General Mack withdrew his army in the direction of Ulm, and fought several engagements to break the impending encirclement which culminated in the Battle of Ulm.
- Engagement at Wertingen (Bavaria), 8 October 1805
- Engagement at Günzburg (Bavaria), 9 October 1805
- Engagement at Haslach-Jungingen, 11 October 1805
- Engagement at Elchingen (Oberelchingen), 14 October 1805
- Engagement at Michelsberg (Ulm), 16 October 1805
- Battle of Ulm, 17 October 1805
Failing to extricate his army from Ulm, General Mack was compelled to surrender on 20 October 1805.