Western in colour, probably pre-1975

I can remember watching this as a kid in the 1970s. All I can remember is the end. It was in a wooden fort, there were a couple of women, a couple of men who weren’t in uniform, and presumably post-civil war cavalry offiers/men. At the end the fort was attacked by (I think Native Americans) and burnt down with a woman and a civilian man the only survivors. I’m guessing it was a 1950s/60s oater and I’ve never come across it again! Thanks in advance for any hints…

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