siege tax question

[Cainehill]

Originally posted by Boron:
i myself can't afford to guard every border very well with most nations until lategame .
so concentrating your main forces on one - two enemies while delaying and disturbing the opponent with relative weak forces is nice too .

Heh. I don't know about all humans - but if someone is doing raids on my provinces, they're likely to have another war on their hands.

Or possibly you mean when you're already in conflict with multiple people, concentrating on one while harassing the other to slow them down?