After further thoughts

how about a merge unit command (in games)

So say, All units enter the game as squads of 60, but u have the ability to merge units, so say for example, you can merge 3 units of peasants, to make one unit of 180, and then control these as one unit. (and to stop any programming problems, you can only merge like units - so u couldn't merge a h6 cav with an h1 peasant erc.)

I dont know how hard this would be to programme......

This would allow u to control large armies, in one battle - without having to many units to move

OR

Maybe use a general/ commander and allocate units the that commander, then when u move one unit in his command they all move.