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(6-8) Ardennes hills

The strategic position of the Ardennes has made it a battleground for European powers for centuries. The region repeatedly changed hands during the early modern period, with parts or all of the Belgian Ardennes being incorporated into France, Germany, the Spanish Netherlands, the Austrian Netherlands and the United Kingdom of the Netherlands at various times. In the 20th century, the Ardennes was widely thought unsuitable for large-scale military operations, due to its difficult terrain and narrow lines of communications.