The enemies are located outside your castle and to destroy them you must destroy the Buildings in which they are located. We would lose a lot of time firing directly at each enemy, so the best thing is to find a strategic site to shoot to collapse everything and die all at once.
You must be very precise with the shot and you will get a better score against less balls spent on each attempt. You must bear in mind that the civilian population is not your goal so destroy everything but without hurting the innocent. Start this great medieval war and look for victory in Castle Siege.
Enjoy the game Castle Siege, it's free, it's one of our castles games we've selected.