The corps of general Dembinski had been more fortunate than those of Chlapowski and Rohland. That general, quitting Kurszany on the 9th of July, returned, in obedience to the orders which we have detailed, by means of the forests, to the environs of Szawla, leaving the enemy upon the right, and without being observed by him;--he having advanced with his whole force in the direction of Worna, under the belief that our undivided forces were in that position. This corps traversed the country between Szawla and Rosseyny, and arrived during the night of the 15th at Janow, where they dispersed a squadron of the enemy's cavalry and took fifty prisoners, and passed there the river Wiliia without interruption. From thence they left for the environs of Kowno, where, not far from Rumszyski, on the 16th, they met a brigade of Russian infantry which was on the march from Wilno to the frontier of Poland. General Dembinski attacked this brigade with such impetuosity, that they were thrown into the greatest consternation. Two cannons and several prisoners were taken. The great forests, by which the Russians were able to effect their escape, alone saved this brigade from entire destruction. Having thus opened their road, they took the direction of the town of Lida, passing the Niemen not far from that place. Afterwards they threw themselves into the forests of Bialystok, and in these forests the corps was reinforced by a considerable number of Lithuanian insurgent cavalry, which had been acting with great advantages over the enemy, by cutting off his transports of ammunition and other modes of harassing him, during the whole of our campaign. This force was under the command of colonel B***. General Dembinski quitted the forests in the environs of Orla, and leaving the town of Bielsk on his right, passed through the town of Bocki, near which he surprised and dispersed a regiment of cossacks, and took several prisoners, and among them a number of officers. In the environs of Siemiatycze, where the corps arrived on the 20th of June, they were arrested by the sudden appearance of a large body of troops. General Dembinski halted and placed his forces in order of battle, sending his flankers in advance. On the other side the same movement was made. The flanking parties of the opposite forces approached each other, but what was the astonishment of the two corps at seeing the tirailleurs, in place of firing upon each other, rushing into each other's arms, and rending the air with patriotic exclamations. The corps which was thus met by that of general Dembinski, was the corps of general Rozycki, which had been sent from our grand army to reinforce the corps of general Gielgud. The reader will now call to mind the plan of operations proposed by colonel Valentin after the battle of Wilno; and the arrival of this reinforcement at the very spot which was to have been the point of concentration aggravates the regret that his plans were not adopted.