Dividing units, realistic?

[nosse]

Hi,
I have played a few games of PW and initially I had a really hard time winning scenarios. But when I started to divide my units into smaller groups I increased the number of men available to fight and eliminated problems with over stacking. I also go a lot more possibility to maneuver, I normally divide the normal roman histati units so basically we go from 140 men per hex to 70. So still we have enough men to take some casualties and still fill up the ranks to fight.

Is it realistic to divide your units or should it be kept to a minimum.