1-98. Isolate is a tactical mission task that requires a unit to seal off—both physically and psychologically— an enemy from sources of support, deny the enemy freedom of movement, and prevent the isolated enemy force from having contact with other enemy forces (FM 3-90-1). When commanders isolate, they deny an enemy or adversary access to capabilities that enable an enemy unit to maneuver in time and space at will. Isolation that is both physical and virtual generates greater cognitive effects than one or the other by itself.