Red Dead Redemption Episode 19: An Appointed Time

"John Marston arrives at Luisa Fortuna's temporary camp, and is told that Vincente de Santa is overseeing a massacre in Sepulcro. Luisa asks Marston to put an end to it, by killing De Santa and all of his soldiers."
"Reyes informs John Marston that he has discovered that Javier Escuella is hiding within the Mexican Army at El Presidio. He invites Marston to join him as Reyes' Rebels attack El Presidio, to kill or capture Escuella, and take over El Presidio."
"The Mexican Army has executed many rebels in Escalera and has caught Abraham Reyes. John Marston arrives to see the citizens fighting the army, and eventually finds a tied-up Reyes, about to be executed."