An atypical realistic Westerns that's dark, brutal & ugly, as well as warm & beautiful
The first act in the Confederate camp is dirty and brutal, ringing with authenticity; this is the furthest thing from those old Westerns where everyone has bright, clean clothes and courteousness abounds. Callahan is a very hardened man after his harrowing prison sentence and thoroughly unwilling to allow a Confederate officer to dishonor him, particularly when Macho's fairly drunk. The opening score is very austere and inspiring in a somber way, but it later morphs into more pleasant aural reveries. This is a thoroughly adult Western, not to mention modern and therefore holds up well after all these decades.
Speaking of which, as dark and harsh as much of this obscure Western is, it's counterpoised by care and sensitivity. For instance, one character apologizes and is forgiven because the recipient discerns it's sincere. Or consider the two protagonists concern for a motherless cub. One person sees through the others' gruffness to recognize essentially noble hearts that live by a code of honor, which is surprising considering one of them just went through hell on earth, and unjustly so. All this points to the "Stockholm syndrome" NOT being at play in the story, as some claim. Watch the movie and see for yourself. See my commentary below for details.
The love and compassion that surface separates "Macho Callahan" from one-dimensional and juvenile Spag Westerns. As such, it's puzzling to hear Brian Garfield lambaste the film as "strictly for sadists" and "revolting." This same critic said "the story defies reason everywhere and is impenetrable," but this simply isn't true. The plot is simple and the characters' motivations are obvious. If you want to see a Western that defies reason watch the original "The Magnificent Seven" (see this thread for details: https://moviechat.org/tt0054047/The-Magnificent-Seven/5b18a79fd4c7780014b72aed/The-good-the-bad-and-the-idiotic-SPOILERS).
Unfortunately, the ending leaves a bad taste in the mouth and I wish it went the route of "The Outlaw Josey Wales." Still, it's worth checking out if you like atypical realistic Westerns that are dark, brutal & ugly, as well as warm & beautiful.
Regarding the Stockholm syndrome issue, this condition occurs when a strong emotional link develops between captor and captive where the former intermittently abuses the other in one way or another, whether beatings, threats, intimidation or harassment. This is not what occurs in the movie: Alexandra hooks up with Callahan & Juan in order to kill Callahan (i.e. she's NOT a captive), and she almost succeeds when the opportunity presents itself. Thus Callahan fights back savagely to survive, BUT he mercifully doesn't kill her; and is clearly concerned about her recovery later.
After this violent episode, Alexandra gets to know Callahan & Juan and slowly discovers that they're not evil. They're basically goodhearted people with some rough edges. Macho saves her life at one point and even trusts her with a rifle. She's NOT a captive and is free to leave when she wants. Callahan even apologizes for what happened to her husband, and sincerely so, but implies that it was a matter of honor between the two men (and, really, it was the greedy bartender's fault). A mutual attraction blossoms into love before the movie's over, ending with the touching sequence during the standoff at the climax.