There are a lot of random things that happen in relation to battles and reinforcements which are probably just magnified when the battle is one of interception. In your case, being the defender may be a reflection of the game wanting to give the fort and "area of control." I was under the impression that normally you are on offense when intercepting, but I haven't intercepted from a fort. I think it just adds to the list another question of how does this work?
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