Nice parts, especially the torso, I like that "iron-shallop-armor" of the black knights.
But the battering ram ain't look strong enough to destroy a heavy door! And the shield on this siegeweapon won't offer any soldier protection against arrows, stones, hot water and pitch. A battering ram needs a arrow-protecting shield with wet leather on it. It would also be clever if there was a meganism which provides the users the possibility to hit the door more than once hit each storm.
So I would give this set an 6/10