If you go to abcnotation.com and search for "Bonaparte's Retreat" you will get six tunes, only two of which seem similar with a quick trial.

Searching for the single word "Bonaparte" turns up more than 10 pages of tunes, not all of which have Bonaparte in the title. Maybe the other tunes had "Bonaparte" in the lyrics.

Bonaparte crossing the Alps
Bonaparte crossing the Rhine
Bonaparte crossing his eyes

I personally play "Bonaparte Crossing the Rocky Mountains," which I'm pretty sure I got from the Fiddler's Fake Book.