The Danish people, threatened with the loss of their independence, flew to arms, determined to defend their country to the last extremity. Charles, his army being small, delayed his attack upon Copenhagen, which might easily have been taken by an immediate assault. When he appeared before it he found all its people converted into armed soldiers, while King Frederick declared that he was ready to die in his capital like a bird in its nest. Every soul in the city burned with patriotism, and nobles, burghers, and laborers alike manned the walls, while even women could be seen wielding spade and axe in the repair of the neglected defences. When the siege began the citizens made several successful sallies against their foes and hope arose in their breasts. But their position soon grew critical, the Swedes seizing the castle of Cronberg and other points commanding the Sound and pushing forward their lines until they had possession of the outer works of the city. The great weakness of the citizens lay in the absence of provisions, which grew so scarce that they would have had to surrender from sheer stress of hunger but for the activity of their allies. The Dutch had enlisted in their cause, and a fleet sent from Holland under Admirals Opdam and DeWitte passed Cronberg and other fortifications held by the Swedes, met the Swedish fleet under Admiral Vrangel in the Sound and fought a bloody battle for the mastery. For six hours the thunder of cannon echoed from the neighboring shores, then the Swedes were put to flight and a favoring wind bore the Dutch ships triumphantly to the beleagured city, bringing food and help to the half-starved defenders. Their coming saved Copenhagen. Charles, baffled in his efforts, drew back, and threw up works of defence ten miles from the city. Suddenly the tide of fortune had turned and began to run strongly against him. Into Holstein pressed an invading army of Austrians, Poles, and Brandenburgers. The Swedes were forced to evacuate Jutland. The newly won provinces were ready to revolt. Part of those held in Norway were taken by the Danes, and the Swedish garrison in the island of Bornholm was annihilated by a sudden revolt of the inhabitants.