This idea is based off the above suggestions and responses. What I would like to see is a way to build a guard tower, assign 2-3 soldiers to the guard tower, and have those soldiers shoot incoming mobs with bow & arrows. Along with the guard tower, the ability to create a 'gate' would be nice. I noticed that you can 'lock' doors, so from this principle it would be nice to have the ability to 'lock' and 'unlock' the gate to allow citizens to pass or prohibit mobs from entering during a siege. The gate would need to have HP, but would be awesome to create higher HP for gates than doors have.
Since the only defense (at least that I have found) of sieges is to direct mobs across a bridge then pause the game and delete the tile, I think defensive structures would add a lot to game- namely realism and really promote the 'RTS' aspect of Towns.
