The Battle of Amstetten was a minor engagement during the War of the Third Coalition between the First French Empire and the alliance of Austria and Russia. It occurred on 5 November 1805, when the retreating Russo-Austrian troops, led by Mikhail Kutuzov, were intercepted by Marshal Joachim Murat's cavalry and a portion of Marshal Jean Lannes' corps. Pyotr Bagration defended against the advancing French troops and allowed the Russian troops to retreat. This was the first fight in which a major part of the Russian Army opposed a significant number of French troops in the open. The total number of Russo-Austrian troops was around 6,700, while the French troops numbered roughly 10,000 troops. The Russo-Austrian forces suffered more casualties but were still able to successfully retreat.