The biggest battle in the history of the National Military Union (Narodowe Zjednoczenie Wojskowe, NZW) took place on May 6–7, 1945, in the village of Kuryłówka in southeastern Poland.
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The Battle of Kuryłówka fought against the Soviet 2nd Border Regiment of the NKVD, ended in a victory for the underground forces commanded by Major Franciszek Przysiężniak ("Marek").