The Siege of Prague occurred during the Thirty Years' War from 1648 to 1649. It involved the forces of the Swedish Empire and their allies besieging the city of Prague, which was held by the Habsburg forces. The siege aimed to weaken Habsburg control in the region and was part of a larger conflict involving various European powers. The siege began in July 1648 and lasted until the end of the year. Despite fierce resistance from the defenders, the Swedish forces eventually captured the city. The siege significantly impacted the war's outcome, contributing to the eventual peace negotiations that led to the Peace of Westphalia in 1648.