Red Dead Redemption Episode 7: Liars, Cheats and Other Proud Americans

"Nigel West Dickens begs John to race for him and win so he can earn some cash."
"John finds Irish having his head dunked in a horse trough by two men intent on killing him. After he has killed the two men, John asks Irish if he might know the location of a Gatling Gun needed to assault Fort Mercer. When Irish responds that he knows the location, they travel to a shack, where Irish disappears at the sight of guards."
"Seth and John venture to find another piece of Seth's map while being chased by bandits."