Just a note but I noticed that crusades that are going through your land are obliged to help defend the province probably regardless of who is attacking. I was playing western Roman in the Fall of Rome MTW mod and a barbarian crusade/horde passing through what would become burgundy helped with defend the province from the Franks. (playing western Rome is rough) I'm pretty confident this would be true in any version of MTW. It's just something I never noticed before.
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