Hi, 

usially in battle, when AI has worse units that I have, it keeps attacking my units and damaging its own units.

Usually it happens when AI's goal to defend its flag, so holding possition looks like the best option, because i have to spend more turns.  

Why it's not implemented yet, especially for city defence?

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TeR wrote:

Hi, 

usially in battle, when AI has worse units that I have, it keeps attacking my units and damaging its own units.

Usually it happens when AI's goal to defend its flag, so holding possition looks like the best option, because i have to spend more turns.  

Why it's not implemented yet, especially for city defence?

On which difficulty are you playing? But it would be interesting to getting like a save file prior to the battle your are referring to so we can check it with the team.