forester warband are, imo, the best ranged units in the campaign.

gauls have an exp 3 temple AND a missile 3 temple.

Build foresters in the exp city and upgrade them in a nearby missile city (can't do it vice versa), and you have 21 missile (170m range), 17 atk (missile upgrades affect melee stats of missile units, lol), 11 def, 8 charge, fast moving, hide anywhere. Really ridiculous. Each unit can take on 2-3 urban units without losing a man. Even if you chase them down with cav, they put a serious hurting on even the best cav in the game.