The Uman region was site of haidamaky uprisings in 1734, 1750, and 1768. Notably during the latter, Cossack rebels Maksym Zalizniak and Ivan Gonta captured Uman during the Koliyivshchyna uprising against Polish rule. During this revolt, a massacre took place against Jews, Poles and Ukrainian Uniates. On the very first day large numbers of Ukrainians deserted the ranks of Polish forces and joined the rebels when the city was surrounded. Thousands from the surrounding areas fled to the Cossack garrison in Uman for protection. The military commander of Uman, Mladanovich, betrayed the city's Jews and allowed the pursuing Cossacks in, in exchange for clemency towards the Polish population. In the span of three days an estimated 20,000 Poles and Jews were slain with extreme cruelty, according to numerous Polish sources, with one source giving an estimate of 2,000 casualties. Uman's modern coat-of-arms commemorates the event depicting a "Koliy" rebel armed with a spear.