The hostilities with Denmark recommenced. King Christian appeared with a fleet and an army, in June, 1518, laying siege to Stockholm. His attacks were valiantly repulsed, and Christian, fearing to be encircled by his enemies, marched away in a southeasterly direction, taking a firm position at Brennkyrka. A Swedish army met him from the south and gave battle one of the last days of July, 1518. It was a fierce conflict, ending with a victory for the Swedes. The chief banner was carried by the squire Gustavus Ericsson Vasa, who five years later was to become king of Sweden. Christian returned to attack Stockholm, once more in vain. He was to sail for Denmark, but was kept back by storms, great suffering being experienced by his men. Christian was forced to open deliberations, making very high demands. But Lord Sten refused to hold a meeting, postponing it to the following year. A few days later, King Christian sent word that he wanted the regent to visit him in his ship on important affairs. Lord Sten, always good-natured and ready to accept peace, thought that the king had changed his mind and was ready to go. But the burgomaster and council of Stockholm prevailed upon him not to go, sure that it would bring him into the enemy’s hands. Lord Sten took their advice and arranged for a meeting on land, sending six Swedish nobles as hostages to the king at his demand. Among these were Dr. Hemming Gad and Gustavus Ericsson Vasa. For two days Lord Sten waited in vain for the king to appear. Then he learned, to his dismay and indignation, that King Christian had sailed to Denmark, taking the hostages with him as prisoners, October 4, 1518.
Christian collected all his forces and resources to crush Sweden. The whole of the following year was spent in preparations. Sweden was placed under ban by the pope, and Christian made himself his representative, the one who was to fulfil the heavenly punishment. In January, 1520, a large Danish army invaded Smaland and West Gothland. Lord Sten made an appeal to the people and gathered a peasant army, with which he met the superior force of the enemy at Bogesund, in West Gothland. The Swedish forces were arranged in line on the frozen surface of Lake Asund. Lord Sten rode in front of the line, encouraging his men, but was seriously wounded during the very first engagement and carried from the field. After two vain attempts, the Danes were victorious in overthrowing the Swedes. These gathered in the wooded hills of Tiveden for a last heroic resistance, which was broken; the Danes taking possession of the provinces to the north. Lord Sten, mortally wounded, died on the ice of Lake Mælar during his journey to Stockholm. Christian continued his march on Stockholm, the castle of which was heroically defended by Lord Sten’s consort, Christine Gyllenstierna, who also tried by support and exhortations to encourage other strongholds not yet surrendered to resist the Danes. The castle of Kalmar was defended by another heroic woman, Anna Bielke. But Christian won, through persuasions and deliberations, what he could not take by violence. His operations were carried on by Dr. Hemming Gad, who, for reasons unknown to history, had changed his old patriotic views and become a friend of Christian. In September, 1520, Christian won Stockholm by peaceful agreement. The 4th of November he was crowned by Trolle, the reinstalled archbishop. At this occasion it caused considerable surprise that only Danes and Germans were knighted, the herald proclaiming that the country was won by sword, for which reason no Swede could be thus honored. This was in striking contrast to Christian’s proclamation of having ascended the throne by right of his descent from St. Eric. Worse things were to follow.