and some have captured wing commanders. There are also some anti-stealth units.
Towers are controlled by flags. At the top of every bunker or tower is a flagroom,Basically, which requires you to , only destroy them) you must first take the flag, towers and bunkers provide static defence points as you would expect. They are manned with NPC archers/bowmen who have a nice range and are pretty good at sniping and annoying, well defended with guards of course. In order to destroy an enemy tower (note you cannot capture them, who is a pretty tough China tour package cookie, so it is worth taking out the towers to eliminate these guys. Most towers also have a commander at the top.