The Warsaw Uprising (Polish: Powstanie Warszawskie) of 1944 (1st August- 2 October) was a major World War II operation by the Polish resistance Home Army (Polish: Armia Krajowa) to liberate Warsaw from Nazi Germany. The Uprising was timed to coincide with the Soviet Union’s Red Army approaching the eastern suburbs of the city and the retreat of German forces. However, the Soviet advance stopped and did not support the Polish fighters, enabling the Germans to regroup and demolish the city while defeating the Polish resistance, which fought for 63 days with little outside support. The Uprising was the largest single military effort taken by any European resistance movement during World War II and it cost around 200.000 lives of Polish fighters.
Learn more about the Warsaw Uprising and the history of the city here: http://www.warsawrising.eu/
You can find here probably the 1st film about the Warsaw Uprising made of original archive materials: http://warsawrising-thefilm.com/the-film/