We'll have to be satisfied sending them a few billion. See “The Mouse that Roared.”
LOL! The Duchy of Grand Fenwick. Again.
Doubt it. The Cherokees in OK tangled with Comanche, Kiowa and Cheyenne.
But I think the Lakota were too far north for them to have much contact.
Possibly you are thinking of the Crow?
The Cherokee and Sioux have had little to do with one another.
The Lakota Sioux kicked the Crow out of the tall grass prairie country during their migration out of Minnesota in the early 19th Century. Most Crows these days (I’ve known a few) loathe the Sioux.