Yet another bug you get to see happen live! This one brought to you by Segesta's rather confusing gate.
I in case it's not working properly : aedui's heavy cavalry is having the hardest time getting out of Segesta. It seems to be running into an invisible wall, not to mention ignoring the actual walls. Infantry made it out just fine though.
EDIT it seems the time I want it to start is not working. You're interested in what happens around 7:16.