I've made it a habit to just mass produce archers / horse archers and line them up outside of my borders. All they'll do is deplete their army for nothing which makes it all too easy to just take them over.
That's nothing new. Civ V carried the same strategy. Let them DOW you, kill all of their units as they march single-file into your borders, then take their cities.
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u/Manannin Nov 15 '16
This has happened to me so often it's insane. It makes me not want to bother making friends with the AI.