Quote Originally Posted by Ktonos
Say, only the Rebels disrupt the trade income, or any enemy factions army posted on your land? If I position my army on a trade rout of an enemy without attacking his city, will he suffer the pillaging?
I'm pretty sure that any enemy army will cause trade disruption and devastation. You can tell it's occurring by checking the world map - after a turn or so there will be a black blotch in the area around an army causing devastation.