One of the toughest missions to beat without taking damage. You can write easily stealth through the first area, but if you don't take out all the enemies in this area they will be drawn to your next camping spot and swarm the area.... They can hit you quite easily when you're camping in the building below Castle Hill, will shoot from the rooftop behind you and throw grenades etc etc.... it's quite easy to take them out from the rooftop where you spawn in - just watch out for guys on the rooftops. If Capo isn't hiding out not patrolling once you get to the Monastery, go back into the map and return - this usually triggers him to start his pistols again. But not always - sometimes you may have to enter into the area to find him.... He's usually in the tunnels to the far end of the building - once you go there be wary of enemies who can seemingly sit through the floor and walls!