Proper use of non-missle calvary?

[steevie]

When you charge do you click on the enemy unit or do you double-click on an area of terrain past the unit so that the calvary runs "through" the line?

Once the calvary has reached the enemy unit, how long do you let them melee? Do you immediately run them out of the melee, reform and then charge again?

I know about flanking manuevers and trying to get behind enemy units and all that, but I'm a little lost on the actual mechanics of the charge and attack.