text: Chapter 11
  Delay Control Measures
  11-26. The delay consists of a series of independent small-unit actions that occur simultaneously across the
  front. Subordinate units need freedom of action. Figure 11-3 depicts common graphics used in a delay
  including assigned areas, PLs, BPs, contact points, checkpoints, engagement areas, trigger lines, points,
  TRPs, and disengagement lines. Commanders designate contact points in front of, between, and behind units
  to assist coordination, ensure continuity of the delay, and draw attention to enemy avenues of approach into
  unit flanks.
  Figure 11-3. Example of common delay control measures
  11-27. Commanders assign each likely enemy avenue of approach to only one subordinate unit when
  designating subordinate units’ assigned areas. When commanders assign subordinates their assigned areas,
  terrain that controls fire and observation into those areas is included.
  11-28. Units designate additional PLs beyond those established by the higher echelon as necessary to
  control the unit’s movement during the delay. A delay line is a phase line over which an enemy is not
  allowed to cross before a specific date and time or enemy condition. The delay line is depicted as part of
  the graphic control measure. Designating delay lines is a command decision that imposes a high degree of
  risk on the delaying unit. The delaying unit does everything in its power—including becoming decisively
  engaged—to prevent enemy forces from crossing that line before the time indicated. A delay line may also
  be event driven. For example, commanders can order delaying units to prevent penetration of the delay line
  until supporting engineers complete construction of rearward obstacle belts.
  Planning a Delay
  11-29. Units must understand and exercise the basic defensive tactics outlined in Chapter 8 to conduct a
  successful delay. However, these defensive basics for a delay have unique considerations, and the
  significance of these considerations varies based on the mission variables. In a delay, units operate on
  extended frontages at great risk from advancing enemy forces. The tactical situation constantly changes and
  the opportunities for maneuver are few. Subordinate units must have the flexibility to take immediate actions