This is where the ounce of prevention comes in.

Mr.Prescott, I wish you would be up and around the camp between taps and midnight to-night.

Keep yourself in the background a bit, and see if you can stop any plebes who may be prowling before they have had a chance to get outside the guard lines.
If you intercept any plebes while they are still within camp limits, demand of them their reasons for being out of their tents.
If the reasons are not entirely satisfactory, turn them over to the cadet officer of the day.

Any plebe so stopped and turned over to the cadet officer of the day will be disciplined, of course, but his punishment will be much lighter than if he were actually caught outside the guard lines.

You understand your instructions, Mr.Prescott ?" "Perfectly, sir." "That is all, Mr.Prescott." Saluting, Dick turned and left the tent.
"That's just like Lieutenant Denton," thought Dick, as he marched away to his own company street.