Sigismund's campaign was poorly planned. He was unable to coordinate his troop movements with his supporters, particularly Fleming who was supposed to attack Charles from Finland. After initial successes (the taking of Kalmar and defeating Charles' troops at Stegeborg), Sigismund's forces were defeated on September 25, 1598, at the Battle of Stångebro, (also known as the battle of Linköping). Sigismund was captured and forced to hand over some of his followers such as the Chancellor of Sweden, Erik Larsson Sparre, (1550–1600). In May 1599, Charles' forces captured the last fortress held by Sigismund, Kalmar. On July 24, 1599, the Riksdag in Stockholm officially dethroned Sigismund. The new King of Sweden was Charles IX of Sweden, and the Polish–Swedish union was dissolved after barely seven years of existence. In March 1600, some of Sigismund's supporters were executed, including five senators in an event known as the Linköping Bloodbath.