text: Appendix C
  Figure C-6. Encircled division perimeter defense
  C-34. The encircled force commander establishes a reserve that is mobile enough to react quickly to events
  anywhere along the perimeter. Therefore, given the availability of sufficient fuel, the unit constitutes a reserve
  using some of any available armored, mechanized, and Stryker units. The unit centrally positions this mobile
  reserve to take advantage of interior lines, which exist if the encircled force commander can maneuver the
  reserve or reinforce threatened positions on the perimeter faster than an enemy force can shift location or
  reinforce. A unit can achieve interior lines through a central position (with operations diverging from a central
  point) from superior lateral LOCs or greater tactical mobility. If only dismounted infantry forces are
  available, the unit establishes small local reserves to react to potential threats. The unit organizes a mobile
  anti-armor element from the best available anti-armor systems. If possible, subordinate echelons also retain
  reserves.
  C-35. While defending encircled, a unit may use the reserve to limit penetrations along the perimeter. The
  reserve may conduct spoiling attacks or counterattacks. The commander initiates a counterattack at the
  decisive moment and location as the enemy force attempts to penetrate friendly defensive positions.
  BREAK OUT FROM AN ENCIRCLEMENT
  C-36. A breakout is an operation conducted by an encircled force to regain freedom of movement or contact
  with friendly units (ADP 3-90). It differs from other attacks only in that a simultaneous defense in other areas
  of the perimeter must be maintained. A breakout is both an offensive and a defensive operation. An encircled
  force normally attempts to conduct breakouts when one of the following four conditions exist:
  * The commander directs the breakout or the breakout falls within the intent of a higher echelon
  commander.
  * The encircled force lacks sufficient relative combat power to defend itself against enemy forces
  attempting to reduce the encirclement.