AI spawning army

[Richard]

Why does AI spawn army on top of you in this game so soon? I barely got tier 3 units just now. I repeled silver infestations, started destroying them. Suddenly, game does old Obi-wan kenobi trick: "Hello there." Spawns AI army of power 1000+ in middle of my empire.
My strongest army is 650.
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My armies are all spread out, fighting infestations. So this one big independent agressive army, just kills my leader, starts picking off my armies 1 by 1, while I just crumble as I am sandwitched.
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It supposedly some random event, IDK. It is horrible. I do not get, how to defend from something like this. Videogames are kinda supposed to be relax place to get from ♥♥♥♥ like this. ♥♥♥♥ like this happens in real life too often. This is depressing.
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I could have done something, if this army hadnt spawned in middle of my three cities. I could have done something, if I had time to react. There was no way to anticipate this ♥♥♥♥. Or to develop strategy. Man, its so random. Randomness of this event just pisses me off. It is like meteor hitting your house.

[DasaKamov]

Originally posted by Richard:

♥♥♥♥ like this happens in real life too often.

Random magical monsters show up in real life to pillage your town? Where do you live? o_o

If it's an army from a random event, the army will usually take no actions and just stand in one spot until you interact with them, or the event timer expires.

If it's a spawn from an infestation, they'll usually beeline toward your closest town, pillage one of your province improvements, and wander off. You can often hole up in one of your towns, raise a couple armies, and then take out the marauders once you're ready.