The Prussian army gained experience as an auxiliary force in the French invasion of Russia, where the "Jäger" were often used on the strategic level to provide support and cover for the rest of the army. They managed to escape the fate of Napoleon's French soldiers after Yorck negotiated a battlefield truce with Russia when, during a rear-guard action, the French withdrew and left Yorck's troops isolated. In the War of the Sixth Coalition that immediately followed, the "Jäger" of the various armies performed well against Napoleon's forces, and Prussian "Jäger" played a significant role in the battles of the Waterloo campaign, holding off Grouchy's corps at the Battle of Wavre.