12th Artillery Battery, Rindö, Coastal battery in Vaxholm Municipality, Sweden.

The 12th Artillery Battery on Rindö is a fortification built in the mid-1870s about 100 metres west of Rindö redoubt. Its core, wedge-shaped in plan with the point facing east, was partly blasted into the bedrock and is surrounded by a storm ditch about ten metres wide and ten metres deep. The whole works measures roughly 100 by 50 metres.

The battery was built in the late 19th century as part of a broader coastal defense system to protect Stockholm. It remained in operation for decades before being decommissioned in 1933 when military strategies shifted.

The battery's number comes from its place in the Vaxholm Line, which ran from Värmdö across Rindö, Vaxholm Castle, Vaxö and Edholma to Lillskär. The three guns moved to Landsort in 1938 served there into the late 1960s, while the fourth stayed behind and the emptied spaces became the central ammunition store for Vaxholm Fortress.

The battery lies on Rindö's western point, about 100 m west of Rindö redoubt, reached by ferry to Rindö and then on foot. The core stands as an island inside a blasted moat roughly 10 m wide and 10 m deep, so expect uneven rock and steep edges; stay back from the moat rim.

The guns were deliberately positioned on Rindö to control shipping along several sea routes approaching Stockholm. This strategic placement made it a critical node in the broader defense network of the archipelago.