It was about the Battle of Rorke’s Drift, which followed immediately after the massacre of the British force at Isandlwana. It follows the facts pretty well. Another movie that deals with this campaign is “Zulu Dawn,” which focuses on the Battle of Isandlwana. Borth films are pretty accurate as to the engagements themselves. I recommend both films.
Rorke’s Drift produced the greatest concentration of VCs awarded in history. As amazing a defense as if the Texans had held on to win at the Alamo or if the 300 Spartans had defeated the Persians instead of dying to the last man to buy time. It saved the Brits from the day before’s disaster at Isandlwana had given the their greatest defeat by African forces. And, although both were in S. Africa the indigenous natives were the white guys. It was the Zulu’s who were the invaders from outside, coming down the east side of Africa from way north of there. There were zero Zulu there before the Brits, much less before the Boer moved there from Holland, finding all of Southern africa empty of people excepting a few hunter gatherer level Bushmen.