Quote Originally Posted by Skott
Use them just like you would HA units. Mounted archers that can move about quickly and once they run out of arrows they can run down seperated or routing units. They do pretty good melee against HA units if you have enough of them.
Yes, but they still wont be able to shoot down turkomans or mamelukes due to their low rate of fire. The only way to do it, is to gang up in melee, but there are better units for that job.

You cannot use them as mounted archers, because they are not mounted archers. They are crossbowmen, and as such cannot be used in the same way. Their low rate of fire means that they will not win any shootouts, and neither will they be able to quickly harass an enemy.