One of my all-time favorites; Michael Caine's first movie, in case you didn't catch that. Absolutely terrific and inspiring war flick. More Victoria Crosses awarded from that battle than any other single engagement in British military history; a simply stunning example of raw courage and devotion to duty.
I saw Caine on Johnny Carson some years ago (well, obviously.......if Johnny was still hosting :)) and they talked about "Zulu". Caine said that when the Zulu tribesmen (yes, they really were Zulus) did the "banging on the shields" thing before attacking, it so terrified their African crewmembers on the set (non-Zulus) that they broke and ran........even though it was just a movie. He said that as powerful as those scenes were in the movie, they paled to actually being there and hearing it.
I must respectfully disagree on one point, though, Ken. I DO think that Zulu is a superb candidate for a remake, and I felt that the movie made the Zulus look like a formidable, "professional", and yes................even honorable.............foe. Political correctness shouldn't stop its making (although I readily admit that I know exactly what scenes you're thinking of when you mention the P.C. forces and how they'd react today......).