Yeah, I see how that works. However, I'm newly wary of the sneak attack on my opposite border from another AI whil I'm busy pounding on another. This means I keep my "peaceful" borders heavily armed to deter any other attackers--but then I don't have a large enough force to truly blitz on the other side and so my campaigns take a lot longer. Oh well.
If you're stuck on a continent with 3 AIs that hate you, and you blitz one, yeah, it's likely the other two might sneak attack. But power plays a huge role here. If you're vastly more powerful than the other civs, you can basically do whatever you like without fear.
Now, there also tend to be games with the opposite situation... when you are trying to invade someone in the Industrial Age, and 15 turns pass with massive losses and no result either way. Usually happens when attacking another continent.
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