Walkthrough for Gates of El Presidio of Red Dead Redemption.
1. Go to R mark in the Map to meet Reyes at the Agave Viejo.
2. Get on the Wagon.
3. Speed up and jump when you see the gate.
4. Search question marks to find Escuella.
5. Follow him through the same window he ran away from and keep going to your left.
6. Jump down the cannon and mount up a horse.
7. You can either kill him or rope him so he rots in the jail.
8. Go to the Green Dot and use the Cannon to kill attackers.
9. Go to the Yellow Dot when you are done with the Cannon.