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.

Father Jan Cieplak was auxiliary bishop of the Mogilev archdiocese, at that time the largest Roman Catholic archdiocese in the world, covering the whole of Russia up to Sakhalin.

The Union of Soviet Socialist Republics was the first communist state in history. The decision to create it was taken on 30 December 1922.

The Polish-Bolshevik war broke out on 14 February 1919. The site of the first confrontation was the town of Mosty near Szczuczyn in the Grodno region, where Polish Army units halted the Red Army’s march.