Haha, it works!! I did this in custom battle. One unit of mongol heavy lancers vs Spanish spear militia. On a successful charge the mongols would wipe out all but 2 or 3 militiamen. But when I have the militia retreat right after the mongols enter full gallop, the mongol charge is broken and they enter pursuit mode. I managed to eventually beat the mongols with spear militias, that is after they retreat and re charge multiple times.