This resulted in a significant shift of troop concentrations by enemy forces over a period of three months.

The entire system could only succeed if heavy troop concentrations were kept at Mainz.

But there are troop concentrations all along the border, right?

These troop concentrations add a sense of urgency and determination to the inspections.

B-52 bombers hit suspected Serbian troop concentrations there again today.

He marked the troop concentrations on the map as best he could.

After a period of troop concentration, the offensive started on 15 May 1943.

After six hours the aircraft were to range further east to attack troop concentrations.

I believe they are covering for a large force, possibly the heavy troop concentration we were sent out to look for.

We believe the troop concentration may be close to your present location.