I can name plenty of tribes (west, central and east) that Apoc has destroyed or is in the process of destroying. Of course I have every confidence that you will try to dismiss any of Apoc's achievements so I really can't be bothered.
So, let me turn the question around...
Please name me one tribe in the EAST (that I might of heard of) that MM actually destroyed? I know of a couple that it went to war with and, of those, I can't think of any that it didn't eventually fail to merge with.
I won't bother asking about which tribes MM beat in the west because it never got close to actually establishing a presence in the west (it was to busy cowering behind the central tribes).