Arrows on Fire: Archers and Tatars shoot flaming arrows at buildings and ships.
While initially a global population limit of 8000 existed, it was removed entirely in Back to War. This was done intentionally, to prevent players from simply walling their bases with few layers of walls and thus leading to protracted sieges. While lack of those two resources doesn't destroy the fortifications, it makes the side building them utterly unable to construct new buildings, as they won't be able to have more than 0 stone and wood.
