There are a few details that would make implementing this difficult. First when you bombard and retreat you need to take a few things into consideration; such as the difference in speed. If the units bombarding are fast enough, the rush units will never catch up. However if that is the case, you will not need to move the entire 30 minutes. However if the unit in pursuit is faster, you may need to either separate into you melee combatants and others or forced march it to stay out to melee combat.
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