Imagine the chaos that chess would be if movements belonged to the player who moved the pieces faster.
some players consider turnblock as skill, I do not
if you want to see who is faster, do not play strategy games, play this:
http://www.bbc.co.uk/science/humanbody/sleep/sheep/reaction_version5.swf
xD
so my suggestion is:
For example, a city with 20 infantry, being attacked by 5 bombers and airtransport with 1 mliítia.
You want to move your units, but as the enemy will lose the battle, you can move at a shorter distance
that's all