Under Versailles, Germany west of the Rhine had been demilitarized, as had the bridgeheads and an area fifty kilometers east of the river. In the Rhineland, German troops, armaments, or fortifications were forbidden. This was to give France time and space to meet any attack inside Germany rather than in Alsace. A demilitarized Rhineland meant that, at the outbreak of war, the French army could march in and occupy the Ruhr, the industrial heartland of Germany. The Rhineland was to France what the Channel was to England. Under Versailles, France had the right to occupy the Rhineland until 1935.
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