main Russian line. Bennigsen reinforced him with two infantry regiments and some cavalry, and directed an artillery battery to fire on the wood. Thus reinforced Barclay attacked the wood. The French were driven out, and Fournier's right flank exposed. This was attacked by twenty squadrons of Russian cavalry, but the 85th French Infantry Regiment formed squares and by a steady fire drove the cavalry off. At about 8:00 PM the combat died away, and Fournier retired to the edge of the woods. The arrival of Fournier's division also had an effect on the French right wing. With the switch of much of the Russian artillery to support Barclay de Tolly, the French were able to use their own guns to support a fresh attack at about 2:00 PM on Baggovut by the brigades of Claparède and Vedel, supported by Gazan on their left. Baggovut's men were driven back over the ravine in their rear, and their guns captured. Ostermann-Tolstoy established a battery to Barclay's right and reinforced by five battalions he attacked. After a desperate fight the French were thrown back and the guns recaptured. The French right and centre fell back to their start positions as night fell. During the night, Bennigsen decided to retire, and did so the next day, 27 December, using the longer road to Różan along the east bank of the Narew. From there he continued his retreat to Ostrołęka. Fournier's division also moved off to rejoin the 3rd Corps at Golymin. Lannes was in no position to pursue the Russians, and occupied Pułtusk on 28 December. Analysis Losses on both sides are disputed. Lannes claimed the Russians lost 2,000 killed, 3,000 wounded and 1,800 prisoners, a total of 6,800; Sir Robert Wilson, British liaison officer with the Russian army, claimed the Russians lost less than 5,000 men. Lannes admitted 700 French killed and 1,500 wounded; Russian authorities said the French losses were 7,000 killed and wounded and 70 prisoners. Given that the French were attacking and exposed to artillery fire, a total for them of 7,000 killed, wounded and prisoners does not seem unreasonable, and a total of 5,000 casualties for the Russians seems a good estimate. Petre quotes the various authorities. Another authority gives French losses as five generals and 140 officers killed or wounded, 3,200 soldiers dead or wounded, and 700 captured. Russian losses are stated as 3,500 total, including 1,500 men