Take that you pesky sassanachs! (combat tips)

[Chaingun]

I find it's generally a poor strategy if the enemy stack has a leader (unless of course you have overwhelming 10 to 1 odds) because when you catch a retreating leader they always seem to inflict more casualties than they take. At least that's how it's been in my experience.

If the stack doesn't have a leader, you tend to get much more predictable results.

I sort of agree in the sense it's not always the best to pursue. The biggest problem when pursuing is attrition; if the enemy army is somewhat large and is retreating inside its own territory you will lose a great number of troops merely to keep the enemy's morale broken. Since it's so damned hard to destroy enemy regiments it means you'll most likely end up losing more manpower than your opponent in the process (though it does keep the enemy from restoring the broken regiments for counter-attacks).