25 December with Ney, the Prussian corps under L'Estocq was driven north towards Königsberg. Augereau's corps seized a second crossing of the Wkra on the 24th at Kołoząb. Realising the danger, Kamensky ordered a retreat to Ostrołęka; the old field marshal, however, appears to have had a mental breakdown and withdrew himself to Grodno. Bennigsen decided to disobey his superior's orders by standing and fighting on 26 December at Pułtusk. He had available the 2nd Division of Lieutenant General Alexander Ivanovich Ostermann-Tolstoy, the 6th Division of Lieutenant General Alexander Karlovich Sedmoratski, part of Lieutenant General Dmitry Golitsyn's 4th Division, and part of Lieutenant General Fabian Gottlieb von Osten-Sacken's 3rd Division. To the north-west, most of the 4th Division commanded by Golitsyn and the 5th Division under Lieutenant General Dmitry Dokhturov fought the Battle of Gołymin on the same day. Weather The weather caused severe difficulties for both sides. Mild autumn weather had lasted longer than normal. The usual frosts, which rendered the inadequate roads passable after the muddy conditions of autumn, were broken by thaws. There was a thaw on 17 December and a two-day thaw on 26 and 27 December. The result was that both sides found it very difficult to manoeuvre; in particular the French (as they were advancing) had great difficulty bringing up their artillery. Davout recorded it took two hours to cover 2½ miles. There were also difficulties with supply. Captain Marcellin Marbot, who was serving with Augereau's Corps wrote: Site Pułtusk lies on the west bank of the River Narew with a suburb on the east bank. The road from Strzegociz crossed the river by a bridge and then ran north-west towards Gołymin. A second road from Warsaw entered the town from the south-west, and then ran along the west bank of the river towards Różan. Before it reached Pułtusk this road was joined by one from Nasielsk. Another longer route to Różan ran along the east bank. The final road was that to Markow, which ran northwards from the town. The town itself lay on low ground. To the north and west lay a plateau, narrowing to a wide ridge nearer the river. A ravine cut into the plateau near the river. A large wood lay on the north-west side of the plateau, towards the village of Mosin. Further out from the plateau more woods covered the approaches from Warsaw. Battle Forces Lannes commanded