Want irrefutable proof of civilization's advance? Look at war. Man gets better at killing with each one.
Boost an ally by 5. Crew.
Ronvid the Incessant, King Henselt, Kaedweni Sergeant, Foltest's Pride, Siege Tower, Siege Master, Reinforced Ballista, Siege Support, Trebuchet, King Radovid V, King Foltest, Ballista, Battering Ram, Combat Engineer, Blue Stripe Scout