September 1629 in the village of Altmark (Stary Targ), in Poland,by the Polish–Lithuanian Commonwealth and Sweden, with helped by Richelieu's envoy Charnacé ending the Polish–Swedish War (1626–1629)，and freeing Gustavus to enter the Thirty Years' War.
The signing of a treaty in September 1629 in Altmark (Stary Targ), Poland, between the Polish-Lithuanian Commonwealth and Sweden, with assistance from Richelieu's envoy Charnacé, ended the Polish-Swedish War (1626–1629). This allowed Gustavus to enter the Thirty Years' War.