Invisible armies and swarm by Jon Evans looks like a good match for what you seek. The authors page about the first book: http://www.rezendi.com/invisibleArmies

Invisible armies and swarm by Jon Evans looks like a good match for what you seek. The authors page about the first book: http://www.rezendi.com/invisibleArmies.htm http://www.rezendi.com/invisibleArmies.htm