 Complete the following phrase:  Mykhailo Krychevsky or Stanisław Krzyczewski or Krzeczowski died 3 August 1649 was a Polish noble, military officer and Cossack commander. He fought for the PolishLithuanian Commonwealth against various Cossack revolts and Crimean Tatar factions. During his time as a Cossack commander, Krychevsky befriended Bohdan Khmelnytsky, who would go on to stage a 