King Charles, after this defeat, turned his principal attention to Norway, where his forces needed reinforcements. The able Major-General Reichwein had proceeded to Throndhjem, shortly after the renewal of the war, with a force of soldiers from the southern part of Norway, and, with the aid of the inhabitants, had driven the Swedes out of Throndhjem Stift. In the south, the citizens of Halden (now Frederickshald) had especially distinguished themselves under the brave Colonel Tonne Hvitfeld, the commandant at the fortress, and the merchant, Peter Olafson Normand. Halden was twice visited by the Swedes, and both attacks were heroically repelled by the citizens. In the beginning of 1660 King Charles sent an army of 5,000 men, under Field-Marshal Kagg, against Halden, and a vigorous siege was commenced. For six weeks one assault after another was repulsed. About half of the able-bodied citizens had fallen, the town was partly destroyed, and the fortifications were badly damaged. But the Swedish army had also suffered great losses, and on February 23d the siege was discontinued and the army returned home, upon learning of the death of Charles X. at Gothenburg (February 13). The Swedes now desired peace, and King Frederick had no reason to wish to continue the war. He readily concluded a peace with the queen-regent of Sweden, which was signed at Copenhagen, May 27, 1660. The Swedes relinquished Throndhjem Stift and the island of Gottland; but otherwise the terms of the Peace of Roskilde were confirmed.