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So I know cannons need line of sight to point at which they're shooting at, thus they can not shoot behind units or target a spot in the 4th rank of the center of a unit etc. What about Organ guns? Do they need LoS? I've heard they can shoot through a horde of their own units, is that right?
For Cannons: You have to see the point where the first shot you aimed will fall. so usually it should be clear shot.
For Organ guns. There are no hits. It is auto hit. You just roll number of hits it scored and roll to wound. However you should at least be able to part of the unit (except the banner) or monster (except the wings etc).