: I only recal Battle Group 7, and Battle Group 3. The problem is, I forget
: when I may have created for WMaiD - or if in fact I'm running off of some
: half-remembered fact I've read.
Please correct me if I'm wrong, but I think it was only Battle Group 7 :^) that was mentioned in the entire trilogy. The Western Arm was significant in that it was humbled by Durandal, but I don't think that necessarily implies that it was only the Western Arm that was deployed against him. Perhaps the Eastern Arm was just behind the Western Arm or was sent to approach Lh'owon from a different direction. In fact there is very strong evidence that this was the case in Terminal 1, message 2 in The Hard Stuff Rules as shown below.
I believe that Battle Group 3 was mentioned in Rubicon but not in the Marathon Trilogy, but I'm not positive of this. Anyone else have evidence one way or the other?