Remains of the casemate in Björkö, which was built by the protection corps to mark target shooting exercises.
Miscellaneous
Houtskärs skyddsvakt was formed on 25.6. 1918 was later transformed into Houtskärs skyddskår had its headquarters in Björkö, the corps was dissolved in 1944. Source A book about Houtskär part 2
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