abstract
| - After conquering Prussia in the autumn of 1806, Napoleon entered Poland to confront the Russian army, which had been preparing to support the Prussians until their sudden defeat. Crossing the river Vistula, the French advance corps took Warsaw on 28 November 1806. The Russian army was under the overall command of Field Marshal Mikhail Kamensky, but he was old and becoming infirm. The Russian First Army of some 55,000 to 68,000 men, commanded by Count Bennigsen, had fallen back from the Vistula to the line of the River Wkra, in order to unite with the Second Army, about 37,000 strong, under Buxhowden, which was approaching from Russia and was still some 15 days march from the First Army. However, realising his mistake in allowing the French to cross the Vistula, Kamensky advanced at the beginning of December to try to regain the line of the river. French forces crossed the Narew River at Modlin on 10 December, and the Prussian Corps commanded by Lestocq failed to retake Thorn. This led Bennigsen on 11 December to issue orders to fall back and hold the line of the River Wkra. When this was reported to Napoleon, he assumed the Russians were in full retreat. He ordered the forces under Murat (the 3rd corps of Davout, 7th of Augereau and 5th under Lannes and the 1st Cavalry Reserve Corps) to pursue towards Pułtusk while Ney, Bernadotte and Bessières (6th, 1st and 2nd Cavalry Reserve Corps respectively) turned the Russian right and Soult's (4th Corps) linked the two wings of the army. Kamensky had reversed the Russian retreat, and ordered an advance to support the troops on the River Ukra. Because of this, the French experienced difficulty crossing the river and it was not until Davout forced a crossing near the junction of the Wkra and the Narew on 22 December that the French were able to advance. On 23 December, after an engagement at Soldau with Bernadotte's 1st Corps, the Prussian corps under Lestocq was driven north towards Königsberg. Realising the danger, Kamensky ordered a retreat on Ostrolenka. Bennigsen decided to disobey and stand and fight on 26 December at Pułtusk. To the north-west, most of the 4th Division commanded by General Golitsyn and the 5th Division under General Dokhturov were falling back towards Ostrolenka via the town of Golymin. The 3rd Division under General Sacken, who had been the link with the Prussians, was also trying to retire via Golymin, but had been driven further north by the French to Ciechanów. Some of the 4th Division's units were at Pułtusk.
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