 On 14 August 1944, the Soviet 49th and 50th Armies captured three of the forts during the Osovets Offensive of Operation Bagration.Fort II remained in German hands until January 1945, when it was abandoned during the Vistula–Oder Offensive.In 1953, the fortress was regarrisoned by a Polish Air Force ammunition depot, which was absorbed into the 11th Regional Materiel Base in 1998.