"How do you use catapults when wargaming with Lego? I've tried actually firing the catapults but when doing that it's hard to get a direct shot."
That sounds pretty historically accurate to me!
I think most people do a skill roll and damage roll to fire it. Assuming the skill roll is ok - the shot is on target.
(Correct me if I'm wrong folks
Ephesians 6:16 "Above all, taking the shield of faith, wherewith ye shall be able to quench all the fiery darts of the wicked. 17 And take the helmet of salvation, and the sword of the Spirit, which is the word of God..."