For me as the Attacker you could have Rout Limiting OFF and my opponents, the defenders, would still have all of his units pass their morale checks after I melee them. 
Frankly I have seen that tactic (of attacking to rout) backfire as many times as it has worked. The attacker ends up with a bunch of Disordered units stuck out and if you can do the counter attack right you can get them to run like wild geese. And if the Isolation Rule is ON they end up weak as kittens.
Whenever I have tried to use that tactic it has backfired on me. Frankly it goes to show that even the best laid plans of mice and men ...
). "... to exclude or deny chance was to go against nature, indeed, chance was to be welcomed because it was part of reality. It was not only a threat but also a positive force to be exploited. Napoleon expressed this idea perfectly in his operational dictum: Engage the enemy, and see what happens. The commander put himself in the way of chance, the power at his disposal and his will to use it enabled him to turn chance into a new reality." As far as this refers to "lucky French die rolls," I will admit to the use of master dice makers from the guild on Corsica...