Though not a general betrayal, I have found it nearly impossible to keep units from going rebel. For instance I was making units in nottingham and autopathing them to Caenarvon. Building 3 at a time sending them across solo. After about 6 turns i looked at the caenarvon castle and there were still only 2 troops. So i looked at nottingham. Nope they weren't there. Then i noticed the pile of grey flags in my land. Apparently all 18 units individually decided to go rebel. everyone made it half way across england and then said the heck with it i like it here.

Curious i then made 2 full stacks of units and sent them. poof! half way across both betrayed me. So now i had 18 single units and 2 full stacks of rebels. in the middle of england. what are the odds i figured. so i sent a full stack of my most expensive units. i figured hey they are payed well... why would they turn coat? sure enough the got half way and... they stayed loyal. i was happy. next turn though just prior to making it to the castle the turned.

I turned off thhe game and found a book to read.

I can say i have only been able to move non-general escorted troops from one city to another about 60% of the time.