Major Dundee (1965) doesn't really show any of the bloody mayhem that Peckinpah shortly became notorious for in the Wild Bunch (1969) - no slow motion body's flying throught the air or long gory bloody shoot outs. What is depicted may have been graphic by 1964 standards (?), but by today's standards seems fairly tame.
Harris' casting in Major Dundee has always puzzled me. He didn't really seem to have a great body of notable film work behind him at the time - that would justify Star status in a Western. He was certainly up to it though - and did a great job. I guess somebody knew something.
The Extended Version:
Richard Harris / Cowboy - Major Dundee Part 3