Truce of Altmark
The six-year Truce of Altmark was signed on 16 /26 September 1629 in the village of Altmark, in Poland, by the Polish–Lithuanian Commonwealth and Sweden, with helped by Richelieu's envoy Charnacé ending the Polish–Swedish War，and freeing Gustavus... Wikipedia
Start date: September 1629
End date: September 25, 1629
Signed: 16 (O.S.)/26 (N.S.) September 1629