Passage: On August 16, the Polish Assault Group commanded by Piłsudski began its march north from the Wieprz River. It faced the Mazyr Group, a Soviet corps that had defeated the Poles during the Kiev operation several months earlier. However, during its pursuit of the retreating Polish armies, the Mozyr Group had lost most of its troops and had been reduced to only one or two divisions covering a 150-kilometre front line on the left flank of the Soviet 16th Army. On the first day of the counteroffensive, only one of the five Polish divisions reported any sort of opposition, while the remaining four, supported by a cavalry brigade, managed to advance north 45 kilometres unopposed. When evening fell, the town of Włodawa had been liberated, and the communication and supply lines of the Soviet 16th Army had been cut. Even Piłsudski was surprised by the extent of these early successes. The Assault Group units covered about 70 kilometres in 36 hours. As planned, it split the Soviet fronts, disrupting the offensive, all without encountering any significant resistance. The Mozyr Group had already been defeated on the first day of the Polish counterattack. Consequently, the Polish armies found what they had hoped for – a large opening between the Soviet fronts. They exploited it ruthlessly, continuing their northward offensive with two armies following and falling on the surprised and confused enemy.On August 18, Tukhachevsky, in his headquarters in Minsk, some 300 miles (500 km) east of Warsaw, realized the extent of his defeat, quickly issuing the orders for the Red Army to retreat and regroup. He wanted to straighten the front line to improve his logistics, regain the initiative and push the Poles back again, but the situation had progressed beyond salvaging. His orders either arrived too late or failed to arrive at all. Soviet General Bzhishkyan's 3rd Cavalry Corps continued to advance toward Pomerania, its lines endangered by the Polish 5th Army, which had finally managed to push back the Red Army and switched over to...

Question: what town had been liberated when evening fell?
Włodawa