Following his successes in the Six Days' Campaign on 10–14 February 1814, Emperor Napoleon headed southward towards the Seine to stop Schwarzenberg's threat to Paris. Forces under Marshals Édouard Mortier and Auguste Marmont were left behind to keep Gebhard Leberecht von Blücher's Army of Silesia under observation. Giving up his plans to finish off Blücher, Napoleon left Montmirail on 15 February with the Imperial Guard and Emmanuel Grouchy's cavalry. In an epic march, with some infantry traveling in carts and wagons, Napoleon's leading forces reached Guignes at 3:00 pm on the 16th after moving in 36 hours. Another authority stated that some troops marched in 36 hours.