Red Dead Redemption Episode 11: The Assault on Fort Mercer

"John Marston and Bonnie MacFarlane try to find Bonnie's father, who has gone missing. They find him standing among several dead men that he speculates have been killed by rustlers. John and Bonnie head back to the ranch only to find that the barn has been set ablaze by Williamson's gang. Marston must get the horses that are trapped out of the burning barn."
"John Marston walks into the Armadillo Sheriff's Office to find Marshal Leigh Johnson and Bonnie's father, Drew MacFarlane. Bonnie has gone missing and her father partly blames Marston."
"John Marston and his group, consisting of Marshal Leigh Johnson, Deputies Eli and Jonah, Nigel West Dickens, Irish, Seth Briars and an unnamed deputy break into Fort Mercer, and try to find and capture Bill Williamson."