The battalion distinguished itself in preliminary maneuvers to the Battle of Rossbach; he took Weißenfels in the first days of November, and forced the defenders to flee; a few days later, he and his company took their share of the spoils in the Battle of Rossbach, on 5 November, when he first covered the weaponry of the army, then engaged in the battle on the left wing, and finally followed the fugitive French and the Army of the Holy Roman Empire to Erfurt. Subsequently, while Frederick marched his army to Leuthen, Mayr covered the road into the Erzgebirge and destroyed all the imperial provisions in Leitmeritz.