With its ranks replenished after the winter actions, the six-regiment division under Nansouty numbered, on 1 June 1807, no less than 3,257 men. It was by far the most powerful heavy cavalry division of the Cavalry Reserve, which then included two other such divisions, the 2nd under Saint-Sulpice and a newly added 3rd, under Espagne. As military operation resumed later in 1807, Nasouty's division was hastily directed towards the town of Deppen, where Marshal Michel Ney had managed to retreat with his Corps, after energetically extricating himself from a dangerous situation, with surprisingly few losses. With Ney's Corps, the Cavalry Reserve and the Guard, Napoleon moved towards Guttstadt, where on 9 June he found a large combined-arms enemy force. Murat took Lasalle's light horse and Nansouty's heavy cavalry and launched a series of charges that drove back the enemy force. Murat continued to press on and pushed the enemy into the streets of Guttstadt, where he penetrated with the cavalry at nightfall. Having fought well with his men, Nansouty was rested the next day, leaving all the action at the Battle of Heilsberg to Espagne's 3rd Heavy Cavalry division.