Close Combat Range

Could there be some kind of visual that shows us the range of the close combat range (the range in which if an order is made close to enemy troops a battle will break out). I am not exactly sure how something like this would be implemented, but I think it would be nice to be able to space out troops like artillery far enough behind defensive troops so that if I want to either move them back or target a different enemy group I can without them getting locked into a battle where they're attacking without their range mechanic and getting shredded.