Questions and Answers about Towers and Their Bonuses:

CRITICAL TOWER RULES:

Towers are the little defensive structures built when you order a unit
to Defend (see the Orders menu in Warlords...)

Ruins are *not* towers, even if they have "Tower" in their name.

Towers may be built in these terrains:
	Any Road, regardless of underlying terrain
	Bridges
	Open (Plains, Swamp, etc.)
	Forest
	Hills

Towers may not be built in these terrains:
	Any city terrain (cities, razed cities, ruins, strongholds, temples)
	Mountains
	Water or Shore
	Port Anchors

A Tower does not come into existence until the *start* of *your* *next* turn
after ordering a unit to Defend in that space.


From Battle Bonuses Guru Gary S. Best:
>A Tower is considered terrain type City, regardless of 
>the terrain of the square.  This is most important when considering terrain 
>bonuses.  For instance, you could move your Heavy Cav onto an open square 
>and it would get a +2.  However, if you turned it into a tower, it would now 
>get a +1 city bonus but would no longer get the +2.  So it would actually be 
>*weaker* in a tower.  Conversely, Spiders in towers do get the +2 terrain 
>bonus in addition to the +1 city bonus.  Towers cannot be built in cities, 
>ruins, temples, water, shore or mountains.  As with cities (and temples and 
>ruins - each of which gives a +2 city bonus), a tower's city bonus can be 
>cancelled by an army with the Cancel City attribute.