Thank you for your reply @udow.
In the end it's not new - how many soldier died through "friendly fire" till now ?
That's true, but consider that this "friendly fire" is rarity and is limited to small group of people. In case of AI switching sites, it would mean that every electronic autonomous device in this particular army will also switch site. I suppose that those devices could communicate with each other and would be controlled by one "brain" (as that is the most efficient solution), so decision of this brain would have impact on every device. Switching sites of AI could directly decide about victory.