Head into the bar in Chuparosa and go to the yellow marker to start the mission and the cut-scene. Once it’s over, follow Ricketts onto the train and sit down for the journey (which you can skip by pressing B/Circle).
When the train arrives at 'Casa Madrugada', get out and call your horse before following Ricketts. Once you reach your destination; get off your horse and follow Ricketts until he meets up with his informant.
You’ll now follow him until you reach a cave in the hills, so hang back under the safety of cover until the men run off leaving you an open invite into the cave! Run inside and get your pistol at the ready. Just like in the mine with Irish, stay crouched and shoot the TNT crates and lanterns to make your path a ton easier to navigate.
When you reach the locked cell, you’ll be asked to cover Ricketts whilst he sets the explosives, so run back to your right and take cover at the crates to give you a perfectly straight shot at the idiots who run up the hill in front of you in succession!
Head back to Ricketts and he’ll blow the charge, now’s the time to get ahead of him and clear the path of enemy troops on your way back to the exit. Remain low and use cover at all times, once you get outside, get back on your own horse and follow Landon up the hill.
The battle isn’t over yet, so get your rifle at the ready as there’ll be a fair amount of long range enemies to contend with here. Once they’re all taken care of, wait with Landon until his informant arrives and the mission will end.