Savary was in command of the V Corps on the extreme French right so as to guard the approaches to Warsaw by the Narew and Bug, and to cover the right rear of the movement northwards.

[5] After the French were driven out of Ostrów on 3 February, Savary received orders to abandon Brok and retire upon Ostrolenka, so as to strengthen his communication with the Emperor's army.

"[3] Oudinot put himself at the head of a successful cavalry charge, cutting the cossacks in the enemy's rearguard to pieces.

According to the 63rd bulletin of the Grande Armée (28 February 1807),[7] the Russians left 1,200 wounded and 1,300 dead on the battlefield, with 7 cannon and two flags captured by the French.

[3] On Napoleon's orders, the V Corps went into winter quarters[8] along the right banks of the Omulew and the Narew down to Serock,[9] holding Ostrolenka with a detachment and repairing the bridge there.

"[8] Savary's action at Ostrolenka had revealed "that the Russians were in no great strength on this side, and that Napoleon had little to fear from any attempt to strike his communications with Warsaw.