"Belfry - These mobile siege towers can provide quick entrance into an enemy city, but they are slow and smart players will usually have their archers destroy oncoming siege towers long before they ever reach their walls. It is highly recommended to scatter melee units all along your walls in case an enemy siege tower does reach the wall. These melee units can hold off the attackers, or at least protect your archers while they shoot down the tower. Belfries can be trained from the Siege Workshop for 220 wood."
Shouldnt theese unites allow ranged units to ride on top of it? or are they broken?