Why do units keep moving on their own?!

Hey, I haven't play 6 since it was a very new game & I'm having problems with unit charging several turns away or retreating mid-combat... which doesn't make sense as they tend to do so when they'd stomp whoever is closest.

What is going on, I'm not even scheduling moves 6 turns out! Yet my dinky lil starter warriors seem to think they should be out sight seeing instead of I don't know, guarding the city! How do I make this nonsense stop?!

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