Walkthrough for Father Abraham of Red Dead Redemption.
1. Go to L mark in the Map to meet Luisa Fortuna.
2. Follow Luisa and get on the Wagon.
3. Mark the road but don't use the marks too close to each other.
4. Go to Yellow Dot up the hill and check the detonator.
5. Now wait for Wagons to get close to the explosives and then use the detonator.
6. Don't let anyone run away, kill all of them.