When the Swedes arrived in Denmark they were shut up in the citadel of Copenhagen, and it was decided that they should be put to death at once. Only, as they had been guilty of no crime, it was not easy to find a pretence for passing sentence upon them. Whilst their fate was pending, Sigbritt urged the king to spare their lives, saying, that so long as he had them in his power, he could impose upon the Swedes laws more and more severe, with the threat of putting their countrymen to instant death if they did not obey them. Christiern, as usual, followed the advice of his mother-in-law, which for once proved the source of blessing to Sweden, and Gustavus and his companions were only shut up in prison.
Gustavus had a kinsman at Copenhagen of the name of Banner, who was much attached to him, and feared that if he lived solely under the eye of the tyrant he would be exposed to many insults. So he prevailed with Christiern to let him keep him in his castle of Calloë, a strong fortress in Denmark, and made himself a surety for him to the amount of six thousand dollars.
In the early part of the year 1520 Christiern declared war. The Swedes were prepared to resist him, for the peasants had come down from the mountains, and had flocked to the standard of Sture until the army was increased to the number of 10,000 men. The cause of the king of Denmark was strongly favoured by the Pope and Trolle, Archbishop of Upsal, who were both very angry because the Protestant faith was daily gaining ground in Sweden. Trolle came of an ancient house, only second in rank and dignity to that of Sture, and a long standing quarrel between these two houses served at the present moment to widen the breach between them.
The Swedes fought bravely, but they were soon overcome, and in a battle at Bogisund, Sture received a wound in the head, of which he died a few days after. The state of the country now seemed hopeless; its regular army only numbered 500 men; those who had crowded its ranks when the war began were brave-hearted men, eager to defend the right, but they were not trained and skilful soldiers. Sture dead, and Gustavus Vasa in prison, there was neither ruler in the land nor leader in strife. The Swedes began indeed to be disheartened; a few of the bravest clung to the hope that a fresh attempt might yet be made to resist the tyrant's power; some, less hopeful, thought it best to lay down their swords and submit; others again, said that they would rather die first. Sture's widow, Christina—herself of royal birth—and a woman of great spirit, came forward to revenge her husband's death, and to implore the Swedes not to desert the cause of freedom. She sent her little son Nil Sture to Dantzig to be out of danger, and went to Stockholm, where she made the people swear rather to bury themselves beneath the ruins of the city, than become the slaves of the Danish king.
For a short time a little gleam of hope broke over the land, but Christiern feeling assured that he could not really call himself King of Sweden until he had Stockholm in his power, resolved to come in person with a great fleet and besiege the capital.
In the meantime Gustavus was sorrowing for the troubles of his fatherland, and his face was clouded and sad when he followed his kinsman Banner to the gay festivals of the Danish court, and heard people tell how the king had triumphed over his countrymen, and was bending by degrees their proud spirit. He was heartily tired, too, of his prison, although he was guarded less strictly now than he had been at first, and was allowed to wander about by himself within one mile of the castle. During his lonely walks he revolved many plans in his mind, and at last one morning at sunrise he put on the disguise of a peasant, and made his escape from Calloë. The first day he wandered about a part of the country unknown to him, and the next day at noon he reached the town of Flensburg, where he feared he should have been betrayed. But outside the town, for his good fortune, he found a number of Saxon merchants who had been buying oxen in Jutland, and were on their way back to Germany; without much trouble he entered their service, and thus got safely out of Denmark.
In the September of the year 1519 he came to the free city of Lubeck, where he made himself known at the Council House, and asked to be received as a guest, secure from the tyranny of the Danish king. Soon after he arrived, Banner came in search of him. He was very angry with Gustavus for having escaped out of his hands, and exposed him to the king's wrath, and wanted him to return with him to Denmark. Gustavus promised to refund the six thousand dollars Banner would be obliged to forfeit, but it was not likely that he would agree to go back to his gloomy prison. So he remained some months at Lubeck, and heard there of the death of Sture and the defeat of his countrymen. It was at this time, when Martin Luther, the great Reformer, came to visit the city of Lubeck, that Gustavus Vasa declared himself a convert to the Protestant faith.
The Council at last promised to assist him with men and money, and granted him a merchant's vessel in which he reached the coast of Sweden towards the end of May in the year 1520. As he approached Stockholm, he found its haven filled by the Danish fleet, and not caring to show himself yet, he landed at a promontory a short distance from Calmar. Stockholm was now possessed by the Danes, King Christiern had taken up his abode in one of the palaces, and Christina had been forced to retire to the castle, which was strongly guarded, and still held out against the Danes. Gustavus entered the city secretly and found his way to the castle, where he was welcomed and received with great honour by Sture's widow. He then went to the market place, and made himself known to the people who had assembled there in crowds, and he told them what a disgrace it was for them to be in bondage to Christiern. The people listened in silence and hung their heads; it seemed as if all spirit had been crushed within them. So Gustavus went back to the castle to see if he could arouse a better feeling there, but the German soldiers who were employed to guard it broke out into fury at the very idea of fighting, they were so utterly tired of all the misery of war, and they would have murdered Gustavus on the spot if Christina had not been there to protect him.
He now saw that his only safety would be at the head of an army: the Danes were all ready to besiege the castle, and it was therefore no longer a place to shelter him; but the moment for action was not yet come, and he roamed about in the country around Stockholm in disguise, now in the forests and now in the fields, hiding by day and travelling by night, and mingling sometimes with the Danes for the purpose of gaining news. And on Sundays, when the peasants were in the churches, he would stand amongst them, and try to cheer them by telling them that happier days were in store for them when they should be free once more. Still the people did not care to listen: they said that so long as they obeyed the King of Denmark, they had salt and herrings in plenty; what more did they want? And sometimes when Gustavus had turned away from them they would shoot after him with their arrows. Such was the abject state they had been brought to by long-continued insult and oppression. Besides this Christiern had spies in all parts, and had set a heavy price upon the head of Gustavus, and threatened all persons who should attempt to conceal him with the punishment of death.
After escaping from many dangers, he came through Ludermannland to the house of Joachim Brahe, a noble councillor of Sweden, who had married his sister Margaret. The meeting between brother and sister was full of joy, and Gustavus hoped that Brahe would have been prevailed upon to take up arms in the defence of his country, but the prudent statesman was not to be enticed. Christiern, whose presence had for a time been required in Denmark, was now on his way to Stockholm, and Brahe was one of the guests invited thither to behold the crown of Sweden placed upon his head. He could see nothing but rashness and certain failure in the project of taking up arms against so powerful a foe. Gustavus, therefore, bade his sister farewell with a heavy heart, and went on his way once more, and after wandering about some time longer in disguise, he retired to a country house at Rafnäes, which belonged to his father, to think over in solitude what was best to be done.