I've noticed quite a number of situations where I clear out rebels from my trade routes, then go back to the town two turns later. There are no rebels in sight, but there is trade disruption hijacking HALF of my trade income! Eeek, I say, and look around for clues. No luck. It's as if the rebels were still there, but there are so many factors that COULD be involved, I haven't been able to nail anything down.

Some light on this would be very helpful.