 Complete the following phrase:  After defeating Napoleon in the Battle of La Rothière, Blüchers army separated from the main Allied army of Austrian Field Marshal Karl Philipp, Prince of Schwarzenberg. Blüchers troops marched northwest and followed the Marne valley in a thrust toward Paris while Schwarzenbergs army moved west through Troyes. Leaving part of his badly outnumbered army to watch Schwarzenbergs slow advance, Napoleon moved north against Blücher. Catching the Silesian Army badly strung out, Napoleon demolished Zakhar Dmitrievich Olsufievs Russian corps in the Battle of Champaubert on 10 February. Turning west, the French emperor defeated Sacken and Yorck in the hard-fought 