After defeating Napoleon in the Battle of La Rothière, Blücher's army separated from the main Allied army of Austrian Field Marshal Karl Philipp, Prince of Schwarzenberg. Blücher's troops marched northwest and followed the Marne valley in a thrust toward Paris while Schwarzenberg's army moved west through Troyes. Leaving part of his badly outnumbered army to watch Schwarzenberg's slow advance, Napoleon moved north against Blücher. Catching the Silesian Army badly strung out, Napoleon demolished Zakhar Dmitrievich Olsufiev's Russian corps in the Battle of Champaubert on 10 February. Turning west, the French emperor defeated Sacken and Yorck in the hard-fought Battle of Montmirail on the following day. As the Allies scrambled north toward Château-Thierry's bridge across the Marne, Napoleon launched his army in hot pursuit but failed to annihilate Yorck and Sacken. Napoleon soon found that Blücher was advancing to attack him with two more corps and the Battle of Vauchamps was fought on 14 February.