You can ussually use providence defence to stop these minor invasions. Otherwise you just have to guess where they'll go, which is typically a province (A) with a temple and/or (B) that is only slightly defended or undefended.
I'll take your word for it that the manuals says that. But even so, I have never seen two armies moving into each other's respective provinces "miss" each other. There is always a battle - it is just a matter of which province the game decides to hold it in.
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BigDaddy said:
The information is from the book, page 12.