Ley
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He will just be in the town, I think - at the bottom...
Okay, fine. Maybe this method is not viable. Then, here's another suggestion:
What if you "scare" the ally by introducing another computer-controlled opponent, whose army power is stronger than your ally's, but weaker than the human player's... - this might make the ally stay in the castle, as they will "fear" the enemy, and the opponent, in turn, will be afraid of the human player... What do you think, is it possible to create something like that? :)
You could consider such a mini-scenario plot as a blitz strategy.
"Единственное, что можно сказать с уверенностью об удаче - она изменит..."