Zulu is what popped for me from this list. Great movie, and great gaming scenario.
I've been told the best scenario I ever DM'd was a counterattack on the Keep on the Borderlands by the denizens of the Caves of Chaos. An epic battle ~160 rounds long, which ended in the great hall of the Keep'd donjon (as I redrew the Keep), with the last few zombies and skeletons pushing back burning tables barricading the bashed down remains of the great doors. Wow, was that fun.
And of course, the Helms Deep battle is my favorite part of the LOTR movies.
I guess the original movie version of such tales might be Gunga Din or Fort Apache in the 1930s, but Zulu did it oh so well.
Hmmm, half the movies listed are great fun, whereas half I've never seen, and some I've never even heard of. Zardoz, eh? I fought alongside a PC with that name once. We got TPK'd.