sentences:  However, Charles X continued the war efforts against Denmark after a council held at Gottorp on 7 July, even though he was in defiance of international equity.Without warning, Denmark was attacked a second time.On 17 July he again landed on Zealand and besieged Copenhagen with its king Frederick III of Denmark, but Copenhagen repelled a major assault and managed to hold out long enough for the Dutch fleet under Lieutenant-Admiral Jacob van Wassenaer Obdam to relieve the city, defeating the Swedish fleet in the Battle of the Sound on 29 October 1658.