It’s a war movie from the maybe 1955 to 1965 I saw it or so. There was a desert setting with many nations involved. Arabs, armies of the civil war era, Ottoman, and many others. Not real sure who was the bad side but what I do remember is the ending where the good guys were about to get wiped out in some old fort with many entrances, all of a sudden reinforcements show up each coming in a different opening and what was neat is there was many nations involved from all parts of that area, I believe it to be a desert area probably in the mid 1800s. So long ago and I do believe it was in color but could be wrong. It was english and I think I was in a theater