About WWII they did not have rules of war what can or cannot be attacked. So Merchant ships were targeted. So my guess they are like the Type 6 type 7 and Type 9 ships had some weapons. But not much to defend them selfs.
First, are you implying there
are rules in ED preventing merchant ships from being targeted? That's just silly.
As for merchant ship weapons, some carried a deck gun or two similar in caliber to a small destroyer. Their weakness was that they were usually made out of wood, not armor plating, so they wouldn't necessarily be able to go toe-to-toe with a destroyer, but a surfaced submarine thinking they could save a torpedo by using their own deck gun would quickly change their mind when going up against an armed merchant ship.
Now the DBX and Asp are Multipurpose type ships. Which they can be combat ships or Explorer type ship. They could also be combat Trade ships.
What's your source on this? I'm not debating, just slightly doubtful. The DBX, for example, is a glass cannon - I know, I tried desperately to turn it into a combat ship back when I was in love with it, and even with engineering, it was "made of wood" like that aforementioned merchant ship. Now the Cobra,
that's a multipurpose ship.
Regardless, the fact that the DBX has two medium and one large HPs as a
small ship, and the Asp has 100 medium HPs, surely this would allow the
large Type-7 to have at least one, if not two medium HPs. No?