With the arrival of our main body, on the night of the 18th, the Russians passed the Narew, but many voitures and stragglers fell into the hands of our cavalry in the forest of Troszyn (12). The general in chief, having given the corps a short rest, and having despatched a detachment, under the command of colonel Sierawski, for the pursuit of the corps of Saken, on the same night continued his march in pursuit of the guard, in the direction of Troszyn (12). On the morning of the next day, arriving at Dlugie-Siodlo (13), this village was found occupied by two regiments of infantry and two of cavalry, the latter covering the village. Our 1st regiment of lancers, which were the leading force, leaving the forest and finding the Russian cavalry in line before that village, threw themselves upon them with the rapidity of lightning. The enemy's cavalry was borne down before them, and pursued by our lancers into the village; but his infantry, under cover of the village, opened a terrible fire upon our cavalry, which compelled them to retire and await the arrival of the artillery. At length, eight pieces of light artillery, commanded by colonel Boehm, arrived, and commenced a vigorous fire of grape upon the village, which compelled the enemy's infantry to evacuate it, and they were pursued with such spirit, that one battalion was taken, and the rest were dispersed in the forest. On the same day, the enemy was again pressed upon in his retreat, in the environs of Xienzopol (14), especially on the passage of the river and marshes of Kamionka. The 1st lancers, and the battery of light artillery, who did not quit the enemy a moment, arrived simultaneously with him at the point of the passage. The enemy was obliged to debouch under the fire of our artillery and the charges of our cavalry, and lost again several hundred in dead, wounded and prisoners. I cannot give the reader a satisfactory explanation, why general Skrzynecki did not pursue the enemy on the 20th. Perhaps he considered the great fatigue of the army, particularly the infantry, which the reader will, of course, presume to have been incurred by the forced march which the distance passed over supposes. Another reason, perhaps, was, that he had sent from this place the first detachment (_i_) for Lithuania, wishing to be sure of its safe passage to the frontiers. The detachment, in fact, left on that day, in the direction of Mniszew, and passed the frontier of the kingdom at the village of Mien, between Ciechanowiec and Suraz, opposite Brainsk.