I have seen Kill Them All meanwhile twice, but the film hasn't improved with the second viewing.
Another SW variation of the Dirty dozen formula, but not made with enough ideas ideas to keep my interest. I only liked the last 10 minutes, the nearly uninterrupted ongoing shoot-outs and fistfights are so carelessly prepared, and are so carelessly connected, that to my surprise the film was slightly boring instead of being exciting.
I'm always a bit helpless when I ask myself what I'm thinking about Castellari as director, but a good action director should have made much, much more out of such material.
Chuck Connors was good in the lead. The rest of his gang was characterized by gimmicks, I didn't care for them.
Frank Wolff lacks his usual charisma, his character was not very believable, and his "surprisingly" / foreseeable change was only a joke.