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Ok, I do not remember how the movie starts or anything in that matter.
Obviously it is set during WWII, possibly in French country side at an old castle. The Nazis are stationed in there.
A father (bearded) goes in there to exact revenge on the rape/murder of his daughter, I believe.
One scene has soldiers running down an underground passage way to fall into a pit off water. The avenger closes and locks a gate on top of them and they drown.
The second scene that I remember is of the top officer peering into mirror. The mirror is slow discolouring then flames shoot through to engulf him. The avenger was in a hidden room behind the mirror with a flamethrower.
Could also be a scene of soldier getting throat cut with bayenette or knife?
I think at the end you see the avenger walking away from the castle then movie finishes. I thought maybe The Keep but that is the supernatural based WWII Nazi film I think?