20 October

The Battle of Ulm fought on 16–19 October 1805 was a series of skirmishes, at the end of the Ulm Campaign, which allowed Napoleon to trap an entire Austrian army under the command of Karl Freiherr Mack von Leiberich with minimal losses and to force its surrender near Ulm in the Electorate of Bavaria.

The Austrians lost thirty thousand as prisoners captured and 10,000 casualties inflicted during the series of skirmishes.

The Ulm Campaign is considered one of the finest examples of a strategic victory. The campaign was won with no major battle. The Austrians fell into the same trap Napoleon had set at the Battle of Marengo, but with greater success. Everything was made to confuse the enemy into defeat and capitulation.