You only disperse if it gives you benefit. It's a balance of security and activity. There is no point in expending resources detecting the enemy, unless doing so gains you something by doing it. EG- When you find them, you must be able to tell someone.
In my experience the biggest factor effecting dispersion is the ability to effectively concentrate fires in time and space.
Also don't forget that weather tends to have far greater effect on that than many realise. What looked good at 18:00hrs can be blanked off by mist and cloud at 05:30hrs the next morning.
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