Pomeranian War

The Pomeranian War was a war between Sweden and Pomerania. The war marked the first Swedish war in the Holy Roman Empire

Background
Magnus IV had just weathered a chain of revolts against his rule, and due to his poor skills in diplomacy, he could not settle it with words. As such he resorted to the time-honored Swedish tradition: War.

His military agenda was to continue Swedish expansion into the Baltic Sea, a policy which he named "Terra Mariana" after the former name for Livonia and his own devotion to the Catholic Church even after the reformation. His first target was the Livonian Order, but they were allied to both Poland (a Swedish ally) and Denmark (Sweden's main rival), and Magnus IV did not want to risk a war with both. Instead, he looked south towards Germany, which was part of the Holy Roman Empire. Through detente with the emperor, Karel VII Mitrovic of Bohemia (it was not known how we successfully cajoled the Emperor), he successfully convinced him to not join the war against Pomerania, especially since Bohemia had ambitions in that land anyways.

Pomerania
Magnus IV declared war on Pomerania on 7 August 1527. Swedish troops were already stationed in Gdansk prior to that, allowing for an easy invasion of the nation. Swedish ships were poised to control the Oresund, preventing any troops from invading the Swedish mainland.

Kolberg was the first Pomeranian fort to be besieged, which was aided by Estonian ships bombarding the coastal defenses on 23 October. Kolberg finally fell on 16 January 1528. Stettin, the war goal in the official war declaration, fell on 22 June 1528. The Swedish navy engaged the Pomeranian navy in the Southern Baltic Sea on 13 July 1528, successfully sinking 4 ships and capturing 2. East Frisian forces snuck through the Oresund during this downtime, and besieged Skane.

The North
Pomeranian forces arrived at Pskov in May 1528, while Gustavstad was besieged in September. The Pomeranian army was attacked by the Swedish and were defeated. Shortly after, peace was signed.

End
The Treaty of Nya Stockholm was signed on 25 October 1528, which ceded Stralsund, Stettin, and Greifswald to Sweden, along with some money and reparations.