The Battle of Hastings

Hello there.
I am veeeeeeeeery beginner in mapmaking.
Currently i am working on my History project about Battle of Hastings. And cinematic i am going to make will by a part of it. So here are the questions i would like to ask.

----------Situation one: The begining of the battle -------------------------------------
What i did: I created some units in editor (i couldnt use Create units in region cuz i wanted to have real battle formations). Than i made few regions around certain batalions like: Harold_Left_Flank. Then i set Variables:
Set variable - Harold_Left_Flank - all units in Harold_Left_Flank_a. I did the same with other units (5 battalions of williams cavalary. Bretons, French, Huscarls and Fryds and 3 battalions of archers). Now as you know the battle was started by Williams archers fowarded by attack of Medium infantry. Fisrt strike was a complete defeat of Williams forces. Now what i want to do is:
-- They fight
-- First strike is over
-- I want units to go back to their regions and form a double line (to prepare to another strike)
-------------------------Situation two: The Breton retreat-------------------------------
Bretons could not stand watching another Williams attack not succeded so they decided to rush. The heroic rush of the Bretons was more than stupid. Bretons ran away and left flank of Harolds forces chased them. Harolds infantry was sure to push the Breton forces away when suddenly Right flank of Williams forces striked at Harolds infatry slaughtering whole Anglo-Saxon division. Now here are the problems:
---- What i use during combat is "owner changing"
Player one and player two are allies
Player one and player three are enemies
Player two ad player three are allies
SO:
Bretons come up the Harolds infantry. Left flank of Harolds owner change owner to p3. Fight. Harolds infantry owner to blue (stop fighting). Bretons run away. Harolds infantry chase them (issue order targeting a poit, both go to the same region). After 15 seconds Harold forces are enough away from william first line to change owner to p3 (fighting team ) and when i change colour all chasing units stop :-/ do i have to repeat order after changing colours?
-----------------------------------Situation three: Tactical retreat--------------------------
As you know the Key to the Williams succes was the false Retreat. The fist line of Harolds forces pretend their retreat. After that Harold braks his shield walls to chace William and that allows William to use his Cavalary on Harolds infantry slaughtering all Harolds forces.
-----------The retreat cannot be chaotic. When almost whole army retreats it is never chaotic. Chaotic retreat is when your troops decide to retreat oon their own because there are only few of them. So i want williams forces to move in nice formation. How can i do that.
--------------------------------------------------------------------------------------------------------
If anyone is interested please tell i can send you a part of my cinematic (i like the first few scenes in it)

I know that what i do is so amateur but please...... forgive me :-P

Only way I can think of is splitting up the group into smaller segments, each on etheir own Region. Then, with intervals of one second, order the groups of those regions to move to another region, while the two sets of regions (from where they move, and to where they move) placed in the same pattern.