Resuming its pursuit of the Prussian army, Nansouty's division was at Potsdam beginning on 25 October, and two days later they participated to the triumphant parade of the Grande Armée in Berlin, before being reviewed by the Emperor on 30 October. Beginning on 7 November, Nansouty and his division were with Murat, heading for the river Vistula, which they crossed on 22 December with the rest of the cavalry reserve. After a brief and successful cavalry action at the Lapazin bridge, they tried to get to the Battle of Golymin in time for the action, but were delayed by the thick mud and by the slower dragoon division that preceded them; they arrived after the battle. The division then took winter quarters in Warsaw, but with Murat on sick leave, Nansouty was soon called to replace him, taking command of Lasalle's light cavalry division and the dragoon divisions of Klein and Milhaud. These divisions were placed in the first line of the army, and Nansouty, although formally placed under the overall command of Marshal Jean-de-Dieu Soult, had orders to act independently and report directly to the Emperor if any unforeseen and extraordinary events should occur. Nansouty handled this new mission with care, personally patrolling the front line and deciding where to place the pickets of light cavalry that were to cover the infantry outposts.