After a brief interval of peace, in April 1758 he received the command of Prussia's troops in the Pomeranian Theater, fighting against the Swedes at Stralsund. Sweden's ally, Russia, sent an army to relieve the blockade, which Dohna held at bay with his small force until the Frederick's arrival with the main army at the Oder; Christoph II subsequently commanded a wing—22,000 strong—of the Prussian force at the first meeting at the Zorndorf, an arguably strategic victory for the Prussians but one at which they suffered high losses. Subsequently, he forced the Russians to lift their siege of the Battle of Kolberg, inflicting 600 casualties on the Russians. After relieving the siege, his wing moved against the Austrians under András Hadik in Saxony. By January 1759, he was back in Pomerania fighting the Swedes, and had taken the towns of Damgarten, Richtenberg, Grimm, Greifswald, Demmin and Anklam for Frederick, pushing the Swedes back to Stralsund and Rügen.