Combat system suggestion - retreat from ranged attackers

[SuiteSisterMary]

One improvement I can think of is that when units retreat from combat with a ranged defender; i.e. say calvary attacking musketmen or riflemen, the defenders, having ranged weapons, should get a free shot at the backs of the retreating unit.

[freezuch]

the artillery(catapult and so on) shoots at the enemy unit as soon as it(enemy unit) within their range. That's your free shot.

[SuiteSisterMary]

Yes, but historically most of the damage done to units is when they're on the run.