Bloody Sunday was a massacre on 25 August 1968 when Soviet soldiers shot three unarmed civilians in Prostějov during Warsaw Pact invasion of Czechoslovakia.
[2][3] On 20 August 1968 armies of five states of Warsaw Pact invaded Czechoslovakia starting occupation of the country.
[4] On 25 August 1968 at 20 pm a large column of Soviet army was passing from Olomouc to Brno through Prostějov.
[5] Soldiers got strayed in streets of Prostějov as Czechoslovaks were modifying or removing traffic markings to disorient Soviets.
Soviets passed through centre of town but due to missing signs they turned wrong way and circled around the city returning back on the access road from Olomouc.