Fort confusion

[Naresh]

Can someone please help me understand how the Ajjam army is walking through through this fort ZoC (from Mosul side) to Adana?

http://steamcommunity.com/id/Sharmandril/screenshot/934928806635062710

 

[Brynjar]

If the movement command was given while the fort was mothballed the movement is still allowed.
In addition, as there is an alternative path (through Trebizond), my understanding is that the AI will also be allowed to walk through the fort.

Edit: Paying for the fort in Trebizond now won't help, since the movement was allowed when the command was given. I don't know if enabling the fort, then restarting the game forces the AI to change its mind.