One must ask around a bit and dig through some of the documentation to discover which Marauder ships are of any use in defence. The descriptions of some ships clearly state that they cannot fire on defence while others state they can. Then others do not say anything at all.
The digging and asking I have done reveals that only the Shark and Piranha can fire in defence. Many of the Marauder ships lack any description at all and seem like any other ship. Additionally when one uses the battle calculator it reveals that the ships that cannot fire in defence do have some defence capability. I have to assume that they use their ramming ability to inflict damage but their guns do not fire. If my assumption about these ships is correct then the statement that they cannot fire unless they are moving is not logical because to ram they have to move.
I think we really need some clear descriptions on the building page for each ship. It should state what they can and can not do.
A
Area51OP