#OTD 80 years ago, on the fifth day of the #WarsawUprising, the tragic "Black Saturday" took place. German forces executed around 20,000 Polish civilians. In total, an estimated 40,000 to 60,000 people, almost all of them noncombatants, were murdered in the Wola massacre.

Maria Wocalewska was a distinguished scoutmaster who led the Polish Girl Scouting and Guiding Association (1921-23). During WW2, she ran a children's care home in Skolimów. She was likely killed #OTD in 1944, in the early days of the #WarsawUprising, refusing to leave her post.

#OTD in 1944, the first of several hundred containers with weapons and supplies was dropped over Warsaw by Allied aircraft. Intended to support the Poles fighting in the #WarsawUprising, most of the drops unfortunately fell into German hands.

#OTD in 1944, Anne Frank and her family were arrested by the German occupiers. They were deported to the KL Auschwitz in the last transport of Jews from the occupied Netherlands. Later transferred to Bergen-Belsen, Anne, her mother, and her sister all perished there.

RT @WarsawRising44: We are grateful that so many scouts came to Warsaw to commemorate the #WarsawRising1944! Thank you💐 .

If anything, it was Germany’s death camp, @ynetnews. Why, it was built by Germany in German-annexed Polish lands, overseen by a German state agency and staffed by German nationals. German police agencies filled it with people from Poland and other countries. German companies

Cracow student Stanisław Pyjas, born #OTD in 1953, was involved in anti-communist organizations and supported workers punished for striking. In 1977, Pyjas died in mysterious circumstances, believed to have been murdered by the secret police of the communist regime of Poland.

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Tourist Information recommends a stroll down the Krakowskie Przedmieście Street in Warsaw. So do we, especially on 5 August. In the morning, the IPN President and soon-to-be President of Poland Karol Nawrocki is opening a demo version of our interactive "Trails of Hope, the

Krzysztof Kamil Baczyński was one of the most promising young voices in Polish poetry. During WW2, he joined the anti-German resistance, wrote for the underground press, and took part in covert operations. He fought in the #WarsawUprising and was killed in action #OTD in 1944.

On 2 August in Warsaw, a historical walking guided tour took place. The route went through the Ochota district, where mass crimes against civilians were committed by thee Germans in August 1944. The event was attended by the IPN Deputy President Karol Polejowski.

Eugeniusz Wajgiel served as a medic in the Polish–Bolshevik War. He became a prolific scholar and a prominent figure in medical education. #OTD in 1944, on the 3rd day of the #WarsawUprising, he and 19 other professors from the University of Warsaw were murdered by the Germans.

A #WarsawUprising street barricade, 1944.

Zdzisław Krasnodębski, a veteran of the Polish–Bolshevik War, fought against the 1939 German-Soviet invasion. He then evacuated to the UK, became the first commander of No. 303 Squadron and took part in the Battle of Britain. After WW2, he remained abroad and died #OTD in 1980.

Zbigniew Ścibor-Rylski fought against the 1939 German-Soviet invasion of Poland, then joined the resistance and led his unit in the #WarsawUprising. After WW2, he became a leading voice for veterans, serving as president of the Warsaw Uprising Association. He died #OTD in 2018.

Stanisław Sedlaczek was a Polish scout instructor and one of the founders of the Polish Scouting and Guiding Association. During WW2, he joined the resistance. In 1941, he was arrested by the Gestapo and sent to KL Auschwitz, where he was murdered #OTD that year.

A group of insurgents in Malczewski Street. The man with the accordion is Wacław Żdżarski, a reporter for the Home Army’s Bureau of Information and Propaganda, one of the people who recorded the #WarsawUprising.

One of the participants in the Treblinka revolt, Samuel Willenberg, managed to reach Warsaw and fought in the #WarsawUprising the following year. After WW2, he created sculptures depicting the horrors of Treblinka, which were later exhibited by the IPN across Poland.

On the 81st anniversary of the #WarsawUprising yesterday, Warsaw honored its heroes:

#OTD in 1943, inmates of the German Treblinka death camp seized the camp’s arsenal and launched an uprising, setting fire to buildings and attempting to escape. Of over 700 insurgents, only about 70 survived the war; most were killed during the revolt or shortly afterward.