Bob,
The things that will slow down a blitzer would be
1) Stronger garrisons in Rebel territory
2) Lower the amount sacking gives
3) Reduced Merc availablitity
4) Increase unrest due to distance from capitol. This would require a larger garrison and more "Happy" buildings to be made before you can afford to move troops out.
5) Make Rebel territories either Pagan or Heritic. Same as 4, but you are limited based on how quickly you can move through religious agents.
4 and 5 slow down a blitz because you run into unrest problems. They won't impact a "Kill everyone else" blitzer, but they will slow down a take and hold blitzer.
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