I am currently reading "The First Heretic" (yes I know that I am a little behind) and I saw where it mentions the 2 missing legions 2 and 11. Now it gave different reasons for each of these chapters as to why they are missing. It also mentions that shortly after the actions taken against these 2 legions the Ultramarines legion increased in size.
Now outside the Heresy series I have not read much 40K, but to me this seems like the most that we know of these 2 legions. Am I correct in this or where else can I go to find out more about these legions?
Thanks.