That in this fine, and the last fine battle of Dwernicki, the Russian corps was not wholly destroyed, was owing to the circumstance that a branch of the river Styr (S), over which the bridge had been destroyed, stopped our pursuit. The Russians, during the night of the 18th, evacuated their position, and took the road to Beresteczko (7), where they took a new position. In regard to tactics, the corps of general Rudiger could not have chosen a worse direction than that of the angle formed by the river Styr, and the frontier of Austria (F). General Dwernicki, by a passage to the right bank of the Styr, could have cut off all the enemy's communications with his other corps, and could have again fought him at the greatest advantage. It was here then that our brave Dwernicki committed his great fault, and in place of acting upon the right bank of the river, where he would have had an open field for the most enlarged operations, he chose to follow up the attack; and as he saw that the enemy could not be safely assailed in front, on account of his strong position between two small lakes, but found that this position was open towards the frontier of Austria,--there it was that the unhappy idea occurred to him, of marching to the environs of Kolodno (8), on the frontier of Austria, and attacking the enemy on that side, feeling sure of victory. But general Rudiger did not wait for this attack. Perceiving his exposed position between the river and the frontier, he was satisfied with being permitted to escape, and declined battle. Upon observing that general Dwernicki was manoeuvring upon the frontiers of Austria, general Rudiger repassed the Styr, avoided the attack by this manoeuvre, and was in a situation to join himself with all the Russian detachments which might come into the province from the heart of Russia, by the different directions of Krzemieniece, Ostrog, &c, and to act with them in surrounding Dwernicki, who was confined in this above described angle. This is what in fact took place.