Yeah, I think that’s a problem with quite a few of Larson’s comics. A lot of it was based on tropes and stereotypes that were more accepted at the time. I’m gen x, so I get the humor, and found it funny back then, but with hindsight some of them were questionable if not outright offensive. In this case, however, he is ridiculing the cavalry for their hubris, when they should have had a better plan against the combined native forces. Custer screwed up and died as a result. If anything, it’s saying the natives were much smarter.