After hearing the news of Ulm, the main army of Archduke Charles, Duke of Teschen began withdrawing from northern Italy and Archduke John of Austria's smaller army pulled out of the County of Tyrol. In the confusion, Rohan's brigade became separated from John's army. First, Rohan attempted to join part of Charles' army. Failing, he had his men move south to link up with the Austrian garrison of Venice. After an epic march Rohan's brigade was cornered short of Venice. Two divisions of the French Army of Italy confronted an Austrian brigade led by Prince Louis Victor de Rohan-Guéméné. The Austrians had made a remarkable march from deep in the Alps to the plains of northern Italy. But, caught between the divisions of Jean Reynier and Laurent Gouvion Saint-Cyr, Rohan surrendered his command after failing to fight his way out.