November 13, 1939
Establishment of the Union of Armed Struggle
The Union of Armed Struggle (ZWZ) was established on November 13, 1939, by order of Gen. Władysław Sikorski as the main underground organization in occupied Poland. ZWZ was formed to replace the Service for Poland's Victory and operated until its transformation into the Home Army in 1942. This organization became the foundation of the Polish Underground State during World War II.
