text: Tactical Mission Tasks
  TURN
  B-63. Turn is a tactical mission task in which a unit forces an enemy
  force from one avenue of approach or movement corridor to
  another. A commander relates obstacles, fires, and terrain to improve
  the friendly tactical situation while degrading the enemy force’s
  situation. For example, in the offense, a commander might want to turn
  a pursued enemy force to place it in a position where the friendly force
  can destroy it. In the defense, a commander might want to turn an
  attacking enemy force to allow the friendly force to conduct a
  counterattack into the enemy force’s flank. The place where the arrow
  breaks indicates the general location of the obstacle complex that will Figure B-29. Turn task
  make enemy forces move from one avenue of approach to another.
  Figure B-29 depicts the turn tactical mission task.
  B-64. Turn is an obstacle effect that integrates fire planning
  and obstacle effort to divert an enemy formation from one
  avenue of approach to an adjacent avenue of approach or
  into an engagement area. Its development requires well-
  defined mobility corridors and avenues of approach. To achieve
  this effect, the obstacles have a subtle orientation relative to the
  enemy force’s approach. The obstacles and their associated fires
  allow bypasses in the direction desired by the friendly scheme of
  maneuver. Finally, the obstacles tie into restrictive terrain at the
  initial point of the turn. A commander normally uses the turn Figure B-30. Turn obstacle effect
  effect on the flanks of an engagement area. The direction of the
  arrow indicates the desired direction of turn. Figure B-30 depicts the turn obstacle effect.