I vote for the final boss battle in Battle of the Bulge where US troops stop the German "Tiger tanks" by rolling barrels of fuel downhill. That final shot of Robert Shaw screaming in terror because he sees this barrel tumbling towards him is idiotic. Also at the end of the movie you see the Germans "retreating from the Ardennes". This was filmed in desert terrain in New Mexico or something. Whatever it was, it looks like the borrowed the location from one of Clint Eastwood's western movies and put the Germans in there.