Lumbergh
Chieftain
should bombard units should be able to counterfire if they are fired upon by another bombard unit, and possibly damage the attacker (like in SMAC)? I think this would better reprsent the artillery duels seen in the us civil war, WWI, etc, and make it possible to destroy enemy bombard units without attacking, espcially if they have a large number of defensive units or are guarded on rough terrain or even another city. It would also apply to earlier bombard units as well for simplicity.