With the main Austrian army north of the Alps defeated (another army under Archduke Charles fought against André Masséna's French army in Italy), Napoleon occupied Vienna on 13 November. Far from his supply lines, he faced a larger Austro-Russian army under the command of Mikhail Kutuzov, with the Emperor Alexander I of Russia personally present. On 2 December, Napoleon crushed the Austro-Russian force in Moravia at Austerlitz (usually considered his greatest victory). He inflicted 25,000 casualties on a numerically superior enemy army while sustaining fewer than 7,000 in his own force.