After trying to manage the Swedish situation from afar, Sigismund invaded with a mercenary army after receiving permission from the Polish legislature, and initially was successful.

[1] Charles then crushed the remaining military opposition from forces loyal to Sigismund and those nobles who had previously taken control of Finland in the Cudgel War.

[4] When in March 1600 a riksdag met in Linköping, Charles, who was meanwhile created omnipotent ruler of Sweden and had repeatedly been offered the Swedish crown, set up a court to try his remaining prisoners.

The noblemen publicly executed on the Linköping market square on 20 March 1600[3] were: Sigismund, who was allowed to return to the Polish–Lithuanian Commonwealth, did not relinquish his desire to regain the throne of Sweden.

On 24 July 1599, the Riksens ständer (Riksdag) in Stockholm officially dethroned Sigismund and named Charles IX Vasa as regent, and the Polish–Swedish union was dissolved after barely seven years of existence.