Battle of Jena–Auerstedt
Napoleon smashed the main Prussian armies at the Battle of Jena–Auerstedt on 14 October 1806 and hunted down the survivors during the remainder of October and November. Having destroyed all Prussian forces west of the Oder, Napoleon pushed east to seize Warsaw. In late December, the initial clashes between the French and Russians at Czarnowo, Golymin, and Pułtusk were without result. The French emperor put his troops into winter quarters east of the Vistula River, but the new Russian commander Levin August von Bennigsen refused to remain passive.