Rheinfelden (rĪnˈfĕldən) [key], town, Aargau canton, N Switzerland, on the Rhine River, opposite the German town of the same name. Although it has one of the largest hydroelectric plants in Europe, Rheinfelden is chiefly noted as a tourist center with saline baths. It was the scene of almost continuous fighting in the Thirty Years War. There, in 1638, Bernhard of Saxe-Weimar defeated the imperial troops and Henri de Rohan was killed.
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