Mixing units in a legion

I was mistaken, I just realized that when I was doing those missions my nations had +1 cav mobility so it was 12, Attila with Belisarius you can attack 3 times due to his -1 mobility per attack active
Mongolian raiders -1 mobility per attack right away instead of after the attack
If Attila had a melee cav and mongolian raider or he could attack 3 times a turn without belisarius (because of forced march)
woad raiders also have mobilize, raiders in general pretty much