Walkthrough for A Frenchman, A Welshman, and An Irishman of Red Dead Redemption.
1. Go to I mark in the Map to find the Irishman between the Cholla Springs and Armadillo.
2. Kill both of them. Use your Dead Eye for easier shots.
3. Mount up and follow Irish.
4. Kill everyone.
5. Search the Cabin for Machine Gun. Be careful with the last enemy inside the Cabin.