they changed the location
the movie seems based on dakota war of 1862 where sioux indians rebelled agianst dakota civlians and unions who were in the war used confedrative captured soldiers to stop indians and they succeeded . but in movie locationa changed from dakota to mexico. there must be some reasons . we know in hollywood always bad indians are apaches not sioux or cheyennes. and battle of them against french may refer to conflict between america and france over algeria in 1960s
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