The Austrians began the war by invading Bavaria with an army of about 70,000 under Karl Mack von Leiberich, and the French army marched out from Boulogne in late July 1805 to confront them.
Os austríacos comezaron a guerra invadindo Baviera cun exército duns 70.000 homes baixo o mando de Karl Mack von Lieberich, e o exército francés saíu de Boulogne a fins de xullo de 1805 para enfrontarse a eles.