The Lwów Uprising () was the armed struggle started by the Polish resistance movement organization Polish Home Army () against the Nazi occupiers in the city of Lwów during World War II. It began on July 23, 1944 as a part of a plan of all-national uprising codenamed Operation Tempest. The uprising lasted until July 27 and resulted in liberation of the city. However, shortly afterwards the Polish soldiers were arrested by the invading Soviets and were forced to join the Red Army or sent to the Gulags. The city itself was occupied by the Soviet Union.