The Underground addon - Far Cry 2

You are sent to war-torn Africa to assassinate The Jackal, a mysterious arms dealer who has rekindled conflict between local warlords, jeopardizing thousands of lives. In order to fulfil your mission you will have to play the warring factions against each other, identify and exploit their weaknesses, and neutralize their superior numbers with surprise, subversion, cunning and, of course, brute force.