In the besieged environs of Peaceful Gulch, threatened by a marauding contingent of bandits and brigands, the town's mayor, formulates a stratagem to deter the encroaching menace.

This plan entails the dissemination of a fabricated report heralding the imminent arrival of three resolute marshals (the Stooges), their identities appropriated from a wanted poster portraying vagrants, valued at a nominal price.

Despite this intricate scheme, the Stooges nearly face expulsion from the township subsequent to a misguided endeavor to administer a purported panacea to the ailing sheriff, afflicted with lumbago, which imperils his well-being.

Subsequently entrusted with the solemn responsibility of safeguarding the town's financial bastion, the Stooges are confronted with a brazen act of bank robbery in their charge's absence.

[1] The film title is a parody of the "Pony Express," a fast mail service that crossed the North American continent from Saint Joseph, Missouri to Sacramento, California from April 1860 to October 1861.