May 15 Treaty of Munster ratified by Spain & Netherlands
May 16 Battle of Zhovti Vody: Ukrainian Cossacks, commanded by Bohdan Khmelnytsky and Crimean Tatars led by Tuhaj Bej, defeat Polish King John II Casimir, after 18 days of battle
May 17 Emperor Ferdinand III defeats Maximilian I of Bavaria
Charles I Tries to Escape
May 29 King Charles I of England attempts to escape captivity at Carisbrooke Castle, Isle of Wight, for second time by hacksawing through a barred window but caught in the act [1]