On the morning of 13 April 1940, NKVD soldiers came banging against the doors of the homes of more than 60,000 residents of eastern Poland. They ordered them to pack quickly and loaded them into cattle wagons.

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