Army configuration

I agree, there is some sort of strategy at play here. But I do not see its military purpose. 

The only purpose seems to be to increase your scout/battle report. Making it near impossible to forward out. 

There is a chance they are playing on the percentage losses to increase chances of holding the square. In the case of the 4 units of each per division, this means that someone would have to inflict at least 25% damages to the defenders in order to reduce the 4 down to 3. potentially making it difficult to reduce the defenders army size. Maybe that will keep the commanders in the fight longer? 

I'm just trying to figure it out. 

And why so few troops per army, check out this sample of the scout report i got from the tourny square in larn. There are about another 20 armies all with a near identical configuration: 

Army: Anise 4
Division: A4 d1
Commander: Longbow 4	Longbowman	1
Troops:	Militiamen	4
Troops:	Pikemen	4
Troops:	Swordsmen	4
Troops:	Men-at-Arms	4
Troops:	Archers	4
Troops:	Longbowmen	4
Troops:	Charioteers	4
Troops:	Knights	4
Division: A4 d2
Troops:	Militiamen	4
Troops:	Pikemen	4
Troops:	Swordsmen	4
Troops:	Men-at-Arms	4
Troops:	Archers	4
Troops:	Longbowmen	4
Troops:	Charioteers	4
Troops:	Knights	4
Division: A4 d3
Troops:	Militiamen	4
Troops:	Pikemen	4
Troops:	Swordsmen	4
Troops:	Men-at-Arms	4
Troops:	Archers	4
Troops:	Longbowmen	4
Troops:	Charioteers	4
Troops:	Knights	4
Division: A4 d4
Troops:	Militiamen	4
Troops:	Pikemen	4
Troops:	Swordsmen	4
Troops:	Men-at-Arms	4
Troops:	Archers	4
Troops:	Longbowmen	4
Troops:	Charioteers	4
Troops:	Knights	4
Division: A4 d5
Troops:	Militiamen	4
Troops:	Pikemen	4
Troops:	Swordsmen	4
Troops:	Men-at-Arms	4
Troops:	Archers	4
Troops:	Longbowmen	4
Troops:	Charioteers	4
Troops:	Knights	4

My best guess is increases the length of battle calculation than can potentially bug out the way things are calculated. Is this accurate? Or is it just to annoy anyone who send a scout report?