Between July 4 and 23, the army fought in the July Offensive, the renewed Soviet offensive in the war. During the offensive, the army rapidly advanced through Belarus, capturing Igumen, Bobruisk, Minsk, Baranovichi, Slonim, and Vawkavysk. On July 25, the Soviet attack on Warsaw began, culminating in the Battle of Warsaw. The 16th Army continued to advance westward, and on the night of August 1, the army attacked Polish general Wladyslaw Sikorski's Polesie Group at Brest-Litovsk after crossing the Western Bug, and captured the town, breaching the fourth and final Polish defensive line in front of Warsaw. The army was unable to exploit its success by quickly advancing on Warsaw, however, because a counterattack by Sikorski in the first week of August threw it back across the Western Bug.