Berend, Gustav got an associate with great military experience and good contacts with the Hansa in Lübeck. Örebro and Västerås castles were besieged and captured at the beginning of 1522. The most important of the fortresses survived, however, and Gustav and the men around him realized that they could not be conquered without warships and heavy artillery. They began negotiations with Lübeck, who had their own interest in being able to trade without being hindered by the Danish king's restrictions. Lübeck was promised freedom of customs in Sweden against help with ships, warriors, cannons and other scarce goods. From May, Lübeck took an active part in the war and the Danish strongholds in Stockholm and Kalmar were subjected to an increasingly intense siege during the autumn. At the same time, Gustav, Berend von Melen and Lübeck began planning an operation to conquer Skåne and other East Danish landscapes. The naval battle near Stockholm prevented important food from reaching the Danish crew in Stockholm. 1523 - Gustav Vasa becomes king The campaign towards Skåne was prepared in January 1523 but was not carried out. Instead, Blekinge and parts of the Norwegian Bohuslän were conquered. In March, Christian II was deposed by a Danish uprising and Frederick I was elected king of Denmark. Thus, Lübeck's interest in collaborating with Gustav to conquer Scania disappeared, and the campaign was interrupted. Kalmar was taken on 27 May 1523. Gustav Eriksson (Vasa) was appointed King of Sweden at the Parliament in Strängnäs on 6 June 1523. Stockholm was taken over on June 17, and on Midsummer's Eve, June 23, 1523, the newly elected King Gustav was able to make his entrance into the capital. During the summer and autumn the last strongholds in the Finnish part of the country gave way and during the late autumn Gustav began a failed attempt to conquer Gotland from Denmark. 1523 - Change of power in Denmark The events in Sweden meant that Christian II's regime was also questioned in Denmark. Due to the executions of several bishops in Stockholm Bloodbath, he came into a tense relationship with the church both in Rome and in Denmark, and as a failed attempt to create a scapegoat, he had his adviser Didrik Slagheck, whom he had recently appointed Archbishop of Lund, executed in January 1522. Christian also enforced a new national ground law which restricted the power of the nobility and