The revolutionaries are not usually grievance driven but ideology driven. Whereas the terrain that they fight their war on is the human terrain and they leverage the grievances of the population to obtain their goals. So in one senses removing the grievances of the population you occupy terrain. The more terrain you occupy the less the revolutionaries have to maneuver on.UPDATE
The author of the quote is Paul J Tompkins, Jr, who has extensive experience in this area.
Regards -- Cliff