The Battle of Montmirail was a battle fought near Montmirail, France, during the Six Days Campaign of the Napoleonic Wars. It was fought on 11 February 1814 and resulted in the victory of the French under Emperor Napoleon I over the Russians under General Fabian Wilhelm von Osten-Sacken and the Prussians under General Ludwig Yorck von Wartenburg. Osten-Sacken's and Yorck's corps each numbered about 18,000, while Napoleon’s had 10,500 (later brought up to 20,000 by arrival of reinforcements) and 36 cannons. Eduard Vogel von Falckenstein participated in the battle as a volunteer Jäger.