What you are about to hear may sound ridiculous, but here me out.

As some of you may know, I've been thinking of making a series of fanfiction that is a crossover between the Whoniverse and The Magic School Bus. What does this have to do with history? Well, Story #3 will be a "pure historical" (no alien elements except for the Bus/TARDIS) that takes place sometime in America's history. Does anybody know of a battle or war involving Native Americans and the US army where the whole situation was a shade of gray (i.e both sides had equal amounts of honorable and dishonorable motives, it's hard to root for one side or the other)? It would really go well for a certain OC's character development.