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Swedish military history encompasses the military engagements and strategic developments of Sweden from prehistoric times to the present day. As a significant European power during the 17th and early 18th centuries, Sweden played a major role in shaping the political landscape of Northern Europe. The country's military history is marked by periods of expansionism, particularly during the Swedish Empire era, followed by a long-standing policy of armed neutrality. Key phases include the Viking Age, the rise of the Swedish Empire, involvement in the Thirty Years' War, the Great Northern War, and more recent participation in United Nations peacekeeping operations. Sweden's military strategies have evolved from aggressive expansion to a focus on territorial defense and international cooperation, reflecting changes in its geopolitical position and global security landscape. Despite maintaining official neutrality through both World Wars, Sweden has continued to adapt its military capabilities and policies in response to regional and global security challenges, including its recent decision to join NATO in response to changing European security dynamics.