Battle of the Bulge region (8)
I believe the answer is:
ardennes
'battle of the bulge region' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ardennes that I've seen before include "Wooded region of south-east Belgium, extending into Luxembourg, France and Germany" , "part of France" , "Wooded area of northeast France" , "Send near to forested region in N Europe" , "Wooded area of France/Belgium" .)