The siege of Hammershus occurred from 16 to 17 June 1645 during the Torstenson War between Sweden and Denmark–Norway.
On 8 June, a Swedish force of 900 men under Carl Gustaf Wrangel landed at Nexø, where they repelled the Danish defenders. While some of the defenders surrendered, many fled to Hammershus under Holger Rosencrantz. After learning that the Danish fleet had returned to Copenhagen, Wrangel decided to proceed with the previously postponed capture of Hammershus.
On 16 June, the Swedes landed at Sandvig and immediately established a redoubt on Nøddebo Hill. Despite initial resistance from the small Danish garrison of 8–9 men, Rosencrantz ultimately capitulated in exchange for safe passage.
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