On April 11, 1943, the first news about the crime committed in the forest near Katyn was released to the world.

On 4 July 1943, at 23:07, moments after take-off from Gibraltar Airport, Liberator II aircraft AL523 with General Władysław Sikorski on board, crashed into the Mediterranean Sea.

On 24 March 1942, the first stage of the evacuation of the soldiers serving in the so-called Anders Army from the Soviet Union to Persia began. About 78,000 exiles, who joined the Polish army and 37 thousand civilians, including about 18,000 Polish children were evacuated in total.

On 4 July 1928, the founding congress of the Sybiraks' Association was held at the Warsaw University of Technology.

This is what journalist Bruno Korotyński wrote in 1924 about the slaughter in Warsaw’s Praga district. It was one of the last, and at the same time most tragic, episodes of the Kościuszko Uprising. On 4 November 1794, after the Polish army had been defeated, Cossacks slaughtered about 20,000 civ