Therefore it came about that he found himself confronted by an army of Danes, Norsemen, and Swedes, and a battle followed in which Albrecht riding with his heavy cavalry upon a frozen marsh, broke through the ice and was taken prisoner. He was now in the power of Queen Margaret, who had at length the opportunity to repay him for his insults. To replace the crowns of Norway and Denmark, which he had sought to wear, she put upon his head a fool's cap, with a tail twenty-eight feet long, and repaid him for his insults and jests in other ways. After she had done her best to make him an object of laughter and ridicule she locked him up in a strong prison cell, where he was given six years to reflect on his folly. It took these six years for Margaret's army to subdue the city of Stockholm, which held out stoutly for Albrecht. She won it at last by setting him free with the proviso that he should pay a ransom of sixty thousand marks. In ease he could not provide it within three years he was to return to prison or surrender Stockholm. He did the latter and Margaret became mistress of Sweden. This able woman had now won a proud position, reached by none of the kings before her. She was ruler of the whole of Scandinavia, with its three ancient kingdoms. The triple crown was hers for the lifting, but she was not ambitious to wear it, and preferred to put it on the head of her grand-nephew, Erik of Pomerania, though she retained the power in her hands until her death in 1412. Representatives of the three kingdoms were summoned by her to a meeting at Calmar, where, in July, 1397, a compact uniting the three kingdoms under one ruler was drawn up and signed. This was the famous Calmar Union, which held Norway captive for more than four hundred years. From that time until the present century Norway had no separate history, though her people vigorously resisted any measures of oppression. In 1536 this ancient kingdom was declared to be a province of Denmark, being treated like a conquered land; yet there was not a man to protest against the humiliation. The loss of national standing had come on so gradually that the people, widely scattered over their mountain land and absorbed in their occupations, scarcely noticed it, though they were quick enough to resent any encroachment upon their personal liberty and rights. There were outbreaks, indeed, from time to time, but these were soon put down and the Danish rule held good.