Cameron Mitchell's voice is dubbed by another actor in the English language version.
The English title, 'Massacre in the Black Forest', is a double misunderstanding. The German title is 'Die Schlacht im Teutoburger Wald', and the word "Schlacht" might sound like "slaughter", but means "battle" (it was held 9BC). And the Teutoburger Wald is in northwest Germany, near Arminia, and is a mixup with the Black Forest (with its gateau...) in southwest Germany, where the battle long was believed to have been held, until less than 40 years ago.