Many years ago I watched a tank movie, set in Normandy (probably made in the 60's or 70's). The only scene I can remember from it was a couple of German tanks climbing out of a tank ditch/river bed and being shot in the belly by Shermans hiding in bushes. Yeah I know, not a lot of detail.

The only tank movie I've been able to find of that vintage is 'The Tanks Are Coming'. It's not that movie.
Any ideas? Thanks.