Same plot and payoff as the Last Samurai—
A civil war veteran in existential crisis ventures out to experience the walk of a “true human” amidst a people whose culture is as striking as it is doomed. And marries a widow.
(Except Algren is an ISTP while Dunbar is violently INFP).
Also, there is no penicillin or water filters to be found but my man kept his foot