Reading this post
Extreme Turtle Style
and being an Old School Turtle I came up with this Idea.
Battle Field Rules
It is very easy and is based off the default setup.
You may have any units you like but NO ONE UNIT can be set any closer to the middle of the field then 3 Tiles from the back.
No unit can be set any closer then that above.
This gives you 5 tiles to cover before you can get in close and even with a bomb and units with alot of movement you can lose. Any setup type can be used. You would have to think on ever move and not make a mistake.