Hetman Koniecpolski recaptured the town of Puck on 2 April 1627. The Swedes planned to strike at Koniecpolski from two directions — Oxenstierna from direction of the Vistula and Johann Streiff von Lauenstein and Maximilian Teuffel from Swedish-held Pomerania. The flooding of the Vistula disrupted their plans and allowed Koniecpolski to intercept the enemy units coming from neighboring Pomerania. In mid-April, Koniecpolski (with 2,150 hussars, 3,290 cossack cavalry, 2,515 western infantry, 1,620 Polish infantry, 1,265 dragoons and 2,000 Ukrainian Cossacks) surrounded a Swedish force inside the town of Czarne (Hammerstein).Three days later the Swedes surrendered, leaving behind their banners and standards. Many of the Swedish troops, who were predominantly newly raised German mercenaries, changed sides to the Commonwealth. This victory also convinced George William, Elector of Brandenburg to declare his support for King Sigismund III.