Operation Ostra Brama (Polish: Operacja „Ostra Brama”, lit. 'Operation Sharp Gate') was the Polish Home Army's attempted takeover of Vilnius (Polish: Wilno) in wake of the German Wehrmacht's evacuation, ahead of the approaching Soviet Red Army's Vilnius offensive. A part of a Polish national uprising, Operation Tempest, the action happened on 7–13 July 1944. The operation's main goal was propagandistic – to claim Vilnius for Poland by retaking it before Soviet arrival. Despite the operation's failure, the Polish government-in-exile continued its political line that led to the catastrophic Warsaw Uprising on 1 August 1944.
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