The Hellbenders

The Hellbenders Italian title I crudeli, lit. The Cruel Ones is a Spaghetti Western directed by Sergio Corbucci in 1966.

A drunken prostitute, Kitty, pretends to be the officers widow. When Kitty is killed attempting a doublecross, Ben persuades Claire, a combination saloon hostess and professional gambler, to take Kittys place they fall in love. They consummate their love during a gunfight between Jonas and a local bounty hunter.The cool Claire proves her worth when feigning grief to a sheriffs posse who stop the wagon and wish to search the coffin suspecting the party may have been responsible for the theft and massacre. The party has another close shave when they stop in a town where the local minister who knew the late Captain Ambrose forces the party to stay for a memorial service where the town can pay their respects. ........

Source: Wikipedia