Dividing units, realistic?

[Titus]

When a unit is split, the newly formed units are assigned a new initial strength. Hence, reducing their strength makes them more susceptable to the fatigue rule explained above by wartwo.
The game is designed to optimise combat effectiveness around 100 strong for HI, MI and around 40 for LI. However, if your LI are long range missile troops better to divide again to a strength of 20. MC / HC are best around 50 - 60 strong. Large cavalry units tend to be wasteful, the unit routing long before you reach half strength.

I hope this gives a few ideas to players