In the Thirty Years' War, Christian tried to become the leader of the Lutheran states in Germany but suffered a crushing defeat at the Battle of Lutter. The result was that the Catholic army under Albrecht von Wallenstein was able to invade, occupy, and pillage Jutland, forcing Denmark to withdraw from the war. Denmark managed to avoid territorial concessions, but King Gustavus Adolphus' intervention in Germany was seen as a sign that the military power of Sweden was on the rise while Denmark's influence in the region was declining. Swedish armies invaded Jutland in 1643 and claimed Scania in 1644. In the 1645 Treaty of Brømsebro, Denmark surrendered Halland, Gotland, the last parts of Danish Estonia, and several provinces in Norway.