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3-59. The leader controls defensive tasks by using control measures to provide the flexibility needed to respond to changes in the situation and allow the defending leader to concentrate combat power at the decisive point. Defensive control measures within the leader’s area of operation include designating the security area, the battle handover line (BHL), the main battle area with its associated forward edge of the battle area, and echelon support area. The leader can use battle positions and additional direct fire control and fire support coordination measures in addition to those control measures to synchronize the employment of combat power. The leader designates disengagement lines to trigger the displacement of subordinate forces.

Next: 3-60: Common Defensive Control Measures

Go Back To: U.S. Army FM 3-21.8: The Infantry Rifle Platoon and Squad