The Battle of the Niemen River was the second-greatest battle of the Polish–Soviet War. It took place near the middle Neman River between the cities of Suwałki, Grodno and Białystok. After having suffered almost complete defeat in the Battle of Warsaw (August 1920), Mikhail Tukhachevski's Red Army forces tried to establish a defensive line, against Józef Piłsudski's counter-attacking Polish Army, running northward from the Polish-Lithuanian border to Polesie, and centering on Grodno. Between September 15 and September 25, 1920, the Poles outflanked the Soviets, once again defeating them. After the mid-October Battle of the Szczara River, the Polish Army had reached the Tarnopol-Dubno-Minsk-Drisa line.