Fort Heldsberg was built 1938–1940 near St. Margrethen in Switzerland, overlooking the Rhine, which forms the Swiss-Austrian border at that location, just south of Lake Constance. The fort was part of the Swiss Border Line defenses, built between 1938 and 1941. In March 1938, Austria was annexed by Germany under the Anschluss, creating a new, potentially hostile section of frontier. The fort at Heldsberg was planned to stop or delay an attack across the nearby Rhine, as well as providing artillery coverage on the southern end of Lake Constance. More information...
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