Watchtowers are very useful things imho. I build lots for the obvious reasons.
Recently it was pointed out elsewhere that rebels tend to like sitting under watchtowers, so I thought I'd try and use this factor to my benfit and it worked.
Place your watchtower where you otherwise might have put a fort, that is a choke point like river crossing or valley and watch as rebels tend to accumulate there. The AI seems to hate attacking rebels in your provinces, so voila! , instant cheap defence.
Of course the down side is the hit on trade but particularly with in smaller peripheral provinces likely to be attacked this is likely to be relatively trivial tradeoff.
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