Guys I am vexed still with the Doom Diver Catapult.
For instance , you can have a Level 4 Wizard Lord on a Horse, and the Doom Diver lands on his head, D6 St 5 Hits.
No armour save.
He's basically dead.
Any character or cavalry unit is open to this attack.
Even Karl Franz can't hide!
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The only thing you can do, is to get a Captasus to move to wthin 12 '' so that the Doom Diver can't fire.
I guess then you can try to engage the crew in CC.
Maybe just move Pistoliers into 12'' also, and try to keep them alive.