[llamabeast]

I don't think nation number makes any difference to move order. In fact, I'm almost certain it doesn't.

In this case, since both players will be teleporting stuff in to grab the province before the battle, the order of teleporting depends on the order in which rituals are cast, which is explicitly stated to be random in the manual. And then whoever wins the battle of the teleporting armies will get to be the defender in the main battle.