Union of Armed Struggle
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The Union of Armed Struggle (Polish: Związek Walki Zbrojnej; ZWZ), also translated as the Union for Armed Struggle, Association of Armed Struggle, and Association for Armed Struggle, was a resistance-movement underground army that was formed in Poland following the country's September 1939 invasion by Germany and the Soviet Union that set off World War II. The ZWZ existed from 13 November 1939 until 14 February 1942, when it was renamed the Home Army (Armia Krajowa, or AK).