Have some Chimes at Midnight. This might actually be my favorite movie, or at least in the top two. And it's deucedly impossible to find.
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ETA:
jucundushomo pointed out that
the battle of Shrewsbury from the same film is also on YouTube. Again, definitely check it out; it is extremely well-done (though the video quality here is a bit grainy) and quite effectively nightmarish. Fans of Branagh's Henry V will note that Branagh was influenced by it in his rendering of the battle of Agincourt.