On 17 March 1813, Yorck made his entry into Berlin in the midst of the wildest exuberance of patriotic joy. On the same day the king declared war. During 1813-14 Yorck led his veterans with conspicuous success. He covered Blücher's retreat after Bautzen and took a decisive part in the battles on the Katzbach. In the advance on Leipzig his corps won the action of Wartenburg (3 October) and took part in the crowning victory in the Battle of the Nations of 18 October. In the campaign in France, Yorck drew off the shattered remnants of Osten-Sacken's corps at Montmirail, and decided the day at Laon.