text: FM 7-100.1________________________________________________________________________________
  AREA DEFENSE
  4-112. In situations where the OPFOR must deny geographic areas (or the
  access to them) or where it is overmatched, it may conduct an operational
  area defense. An area defense uses complex battle positions to protect key
  components of the OPFOR’s combat power while creating opportunities, if
  possible, to attack the enemy’s combat system. Not every component of
  OPFOR combat power needs to or will be able to operate from complex battle
  positions. However, those components most central for the OPFOR com-
  mander’s plan will be the priority for preservation. Area defense is designed to
  achieve a decision in one of two ways:
  • By forcing the enemy’s offensive operations to culminate before he can
  achieve his objectives.
  • By denying the enemy his objectives while preserving combat power until
  decision can be achieved through strategic operations (see Chapter 1).
  See Figures 4-6 and 4-7 for examples of area defense.
  OSC
  Enemy
  Kill
  Zone
  X X X
  Marsh
  DTG
  Battle X X X
  Zone I I Forest
  DTG
  Battle
  Zone
  Disruption
  Zone Kill
  Kill Zone
  X
  Zone
  X DTG
  Enemy
  Disruption
  Enemy B Za ot ntl ee
  Zone
  X
  X
  X
  LEGEND
  O
  S
  C Complex
  Battle
  Position
  Figure 4-6. Area Defense (Example 1)