What movie is it? prison, painting, treasure

Hi all,

I can only remember a few details. There are some guys in a prison and they try to scape to find a treasure. There are two brothers, one of them is chubby. He paints, and I think they try to scape during an exposition.

Any idea?

‘There was a Crooked Man’ (1970) with Kirk Douglas and Henry Fonda ?

Oh, yes!! Thank you very much! :pray::pray: