can you name this western movie?

I saw this western movie years ago... and I remember is it was in color, it was a movie about the cavalry in a fort in the west that was eventually attacked by Indians and over run, and burned... the last cavalry soldier was killed, if I remember, was when an Indian threw a spear and impaled him on a door or something like that... and the fort looked kind of small... looked like it was filmed on a really small soundstage... I don't remember who was in it... I was a kid... It looked to be from either the 50's, maybe 60's, not sure...

any titles ideas...