IIRC, it was actually an unknown alien race that attacked the station in the comic. When the crew went abord, they discovered some race that was squatting in the station. They were hostile, and during the fight, the station was damaged further and pushed into the atmosphere.
As to the request in this thread, it would be great if someone could finish the B4 model by adding turrets to it. I have a campaign design that I've been working on for the last couple years that would include the B4 station as a central component. Basically, B4 would be the central base of operations in my campaign. I love the station, but I hate the idea of making it only a "backdrop" or only using it in non-combat missions. Especially when, according to what tech info I can find, B4 was supposed to be more of a "battle station" with far heavier weapons and armor.
Heck, from what I have heard, the model for B4 was supposed to be the original model for the series, but their computers could not handel rendering the station on a routine basis.