As the outnumbered Austrians retreated, Charles looked for a chance to throw a superior force against one of the French armies. That opportunity came in late August when a cavalry brigadier Friedrich Joseph, Count of Nauendorf reported an opening. Leaving Latour's army severely weakened, the archduke rapidly marched north with 27,000 troops to join with Wartensleben in defeating Jourdan at the Battle of Amberg on 24 August. Unaware of Charles' maneuver, Moreau forged ahead and smashed the isolated "Schröder" Infantry Regiment Nr. 7 at Friedberg. Unfortunately for Moreau, Jourdan's drubbing at Amberg and a second defeat at Würzburg ruined the French offensive. By the beginning of September, the increasingly isolated Moreau was compelled to retrace his steps toward France.