After the battle of Grochow, the Polish grand army was composed, as at the commencement of the war, of nine regiments of infantry, each consisting of three battalions. They amounted, after deducting the losses sustained during the campaign, to about 25,000. The newly formed infantry, which was in the battle of Grochow, amounted to about 6,000; from which are to be deducted about 500, lost in that battle. The whole force of infantry, then, amounted to 30,500 men. The cavalry was also composed of nine regiments, each comprising four squadrons; making, after the deduction of the losses by that battle, about 6,000 in all. The newly-formed cavalry, consisting of eighteen squadrons, can also be estimated, after the losses at Grochow, at about 3,000; making, in all, 9,000 cavalry. The artillery was composed of ninety-six pieces of cannon. Total of the grand army:--_Infantry_, 30,500. _Cavalry_, 9,000. _Artillery_, 96 pieces. The detached corps of general Dwernicki consisted, at the beginning of the campaign, of one regiment of infantry, composed of three battalions, numbering, after the losses of the campaign, 2,800 men. The cavalry consisted of six squadrons, making, in all, about 1,000. The artillery, consisting at first of but three pieces, augmented by seven pieces taken from the Russians, amounted then to 10 pieces. The small partizan corps under the command of colonel Valentin, operating in the environs of Pultusk, consisted of 600 infantry and 100 cavalry. The garrison of Zamosc consisted of 3,000 infantry and eighty-four pieces of cannon. That of Modlin, of 3,500 infantry and seventy-two pieces of cannon; and that of Praga, of 2,000 infantry and thirty-six pieces of cannon. The total amount then, of disposable forces, (excluding, of course, the garrisons,) on the 1st of March, the day on which Skrzynecki took the command, was,--_Infantry_, 33,900. _Cavalry_, 10,100. _Artillery_, 106 pieces.