The date of 11 November 1918, being the day on which Poland regained its independence, is a symbolic date. Exactly on that day, an armistice ending the First World War was concluded in a wagon in the forest of Compiègne.
On August 12, 1941, the authorities of the Soviet Union gave "amnesty" to hundreds of thousands of Poles deported to Siberia.
The Sikorski-Mayski Agreement - Document that Gave Freedom
The day of 25 June 1941 in Białystok had a tragic both end and beginning.
On 18 March 1921, the treaty ending the Polish-Bolshevik war (the so-called Treaty of Riga) was signed in Riga.
The first Siberian fortresses were built by Polish prisoners of war who had been taken captive by Moscow authorities precisely during the war initiated by Stefan Batory.