I've heard that generals get an automatic +5 HP, and captains get +1. This is why they're so often among the last in their units to die. A Cruelly Scarred, Hale and Hearty general would thus have no less than 21 HP. The bugger would be vastly tougher than an elephant!

(Actually, I've heard a dev say that there's an HP limit of 15, but that's still better than an elephant.)

-Simetrical