2 gunboats41 men (garrison) The Battle of Bengtskär was an amphibious landing action fought between Finnish and Soviet forces on 26 July 1941 during the Continuation War.

As a result of the Moscow Peace Treaty, Finland lost the city and port of Hanko to the Soviet Union.

The port was used as a base by the Soviet Baltic Fleet from which they could dominate the Gulf of Finland.

The port in Hanko was within range of the heavy guns at Örö fortress, but a forward observation post was needed to direct their fire.

After this, a new observation post was set up at Bengtskär, which was reinforced by a platoon of Finnish marines under the command of Lieutenant Fred Luther.