Elżbieta Zawacka (; 19 March 1909 – 10 January 2009), known also by her war-time nom de guerre Zo, was a Polish university professor, scouting instructor, SOE agent and a freedom fighter during World War II. She was promoted to brigadier general of the Polish Army (the second woman in the history of the Polish Army to hold this rank) by President Lech Kaczyński on 3 May 2006. Sometimes called "the only woman among the Cichociemni", she served as a courier for the Home Army, carrying letters and other documents from Nazi-occupied Poland to the Polish government in exile in London and back. Her regular route ran from Warsaw through Berlin and Sweden to London. She was also responsible for organizing routes for other couriers of the Home Army. Biography Elżbieta Zawacka was born in Toruń (in German, Thorn), part of the Prussian Partition of Poland, and graduated from Poznań University in mathematics. When she was 10 years old, in 1919, her city, Toruń, returned to reborn Poland, which regained independence in 1918. She passed her high school diploma in Polish Toruń. In the late 1930s she taught at several secondary schools, simultaneously working as an instructor for Przysposobienie Wojskowe Kobiet (Women's Military Training). During the 1939 invasion of Poland, she was commandant of the Silesian-district Women's Military Training, participating in the defense of Lwów. In October 1939 she joined the Silesian branch of Armed Resistance under the nom de guerre "Zelma", which she later changed to "Zo". In late 1940 she was transferred to Warsaw and began performing courier journeys. She was also deputy head of Zagroda, the Home Army's Foreign Communication Department. In February 1943 she traveled across Germany, France, and Spain to Gibraltar, whence she was transported by air to London. In Britain she underwent parachute training, and on 10 September 1943 she dropped into Poland, said to be "the only woman in the history of the Silent Unseen" (disputed, as she had not completed the full training course). In 1944 Zawacka fought in the Warsaw Uprising, and after its defeat moved to Kraków, where she continued her underground activities. In 1945 she joined the anti-Communist organization Freedom and Independence (WiN), but quit soon afterwards and took up a teaching job. In 1951 she was arrested and tortured by Urząd Bezpieczeństwa (Security Service of the Ministry of Internal Affairs). She was sentenced to 10 years in prison