Found this one on Veoh.com; I haven't seen it online anywhere else, and it's not on DVD yet. It used to run on "The Bugs Bunny and Tweety Show" a lot, and as a kid it was one of my favorite Bugs Bunny cartoons. Now, not so much, but it's still enjoyable.
It's notable as one of the few Bugs cartoons Friz Freleng made in the '50s that didn't have Yosemite Sam as Bugs' adversary. Sam was a great character, but I thought Freleng limited himself too much by having Sam in almost every cartoon. From 1942 through 1949 Freleng's Bugs cartoons were arguably the best at the studio, and one reason was that more than any other director, he kept mixing up the formula, moving beyond the basic format of "A Wild Hare" and finding new situations for Bugs to be in and different types of characters for him to interact with. (Like the "Little Red Riding Rabbit" idea of putting Bugs against a "villain" he doesn't really dislike and a third, "good" character he actually hates more than the supposed villain.) Once Sam became to the Bugs cartoons what Sylvester was to all Freleng's other cartoons, Freleng's Bugs Bunnies became more formulaic, because the Bugs/Sam cartoons were pretty much the same no matter where the cartoon took place.
Actually Napoleon in "Napoleon Bunny-Part" is pretty much Yosemite Sam with a French accent (and one of those annoying designs Hawley Pratt was obsessed with in the '50s, the rectangular flat head that juts out at the back). And his henchman, of course, is Mugsy from "Bugs and Thugs."
Also, while I have my problems with Gerry Chiniquy's animation in the post-1955 cartoons, I do like his work in the scene with Bugs and Napoleon (Napoleon moving the stuff around on the map, Bugs taking snuff). It's recognizably his jerky, poppy style, but for once it feels like the characters are acting in distinct ways instead of just bobbing up and down when it's their turn to talk.