Norman 27-17
Breton (936AD) 27-18
Avar (558AD) 30-19
Anglo-Danish 33-21
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Anglo-Saxon (871AD) 33-24
I know for a fact that the Anglo-Saxon army here is viable in multi-player with a fairly standard selection giving an army size of 27/28 units. But things start to get a bit tighter with the Anglo-Danish where a standard selection will only give you 25/26 units and four of those are raw shieldwall. Their most likely historical opponents, the Welsh, can field a standard army of around 36 units in comparison. And then you get to the Normans who are the most challenged army that I have looked at so far and they can put out an army of 25 units, but it does include 3 mob units. I will look at this army in more detail in a moment as I think really that they should be a bit more difficult to play against considering their troubled history.
There are not that many of these armies and they seem to be clustered in the Early Medieval period, but please feel free to add any other ones that you feel are a bit on the small side.
Edit: I have corrected these figures slightly as initially I had inadvertently left my game on "Legate" level instead of "Tribune".





