While the Red Army pushed forward, Gayk Bzhishkyan's Cavalry Corps, together with the 4th Army, crossed the Wkra River and advanced towards the town of Włocławek. The 15th and 3rd Armies were approaching Modlin Fortress and the 16th Army moved towards Warsaw. The final Russian assault on Warsaw began on August 12. The Soviet 16th Army commenced the attack at the town of Radzymin (only 23 kilometres east of the city), and captured it the following day. This initial success of the Red Army prompted Piłsudski to move up his plans by 24 hours.