Still, that strikes me as more of a post-Biological Warfare espionage mission that causes a disease than an actual disease, unless there's a "holy crap, the monkeys are loose!" event. EDIT: Back to the military issue - I was considering a modern promotion, "Combat Engineer," requiring Combat 3, City Raider 3, or Amphibious, available only to gunpowder units. There are several possibilities as to what it could do... 1 - Reduce movement costs as per Mobility 2 - Reduce or eliminate defensive bonus from city or fortification 3 - Allow instant fortification of a unit With this, then, I'd also recommend a unit, Combat Engineer, that gains the promotion at creation, which Flamethrower could upgrade to. Statistically it should be similar to the other specialized infantry formations, Marine and Paratrooper, with perhaps a "Modern Sapper" unit upgrade. EDIT2: Argh - one of the things I like about this mod is that Elephants can do something other than attack horsemen; I saw the Combat Engineer unit as being able to do similar things (build Roads, Forts, Bunkers, clear woods and jungle) in the modern era.