The Border Line defenses of Switzerland were constructed in the late 1930s in response to increasing tensions between Switzerland and its neighbours, chiefly the Axis powers of Germany and Italy. The Border Line was planned to slow or hold an invading force at the border. It consisted of a series of bunkers spaced at short intervals along the French, German and Austrian borders. The bunkers were reinforced by larger multi-blockhouse forts at key points. Most of the positions were within two or three kilometers of the frontier.
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