The Siege of Pärnu (Polish: Parnawa) took place between February 28 and March 2, 1609 during the Polish–Swedish War (1600–1611).The Polish-Lithuanian hetman Jan Karol Chodkiewicz, while resting his forces in Birże (Biržai), learned of Swedish deployments from Pärnu (present day Estonia) moving towards Daugavgrīva (in present day Latvia) and set out to cut these off.