[Norfleet]

With the exception of archers, I haven't noticed that units tend to persistently chase routing units, to the point of ignoring active threats, even when being attacked by another unit: If they become engaged with another unit, they usually start fighting again and ignore the routing unit.

This may have something to do with my thinking: In Medieval: Total War, for instance, I'd often deliberately keep a unit of fast cavalry in reserve SPECIFICALLY to chase and slaughter routing units, just to slaughter them so I never have to fight them again.