During the second relief of Mantua, Heinrich led a 5,200-man brigade in Paul Davidovich's corps. His area of responsibility stretched from the northern tip of Lake Garda to Trento on the west side of the Adige river. On 3 September a 10,000-man French division led by Claude Belgrand de Vaubois drove his outposts out of Nago–Torbole on the lake. An overconfident army command ordered him to attack the French the next day, but he admitted that this was not possible. In the subsequent Battle of Rovereto on 4 September, he defended the camp of Mori on the west bank, while his colleagues Josef Vukassovich and Johann Sporck held Marco on the east bank. Bonaparte in greatly superior strength routed Davidovich's corps and drove them north of Trento.