text: Pursuit
  movement formations to breach any unpassable obstacles quickly. Engineers accompanying the encircling
  force must also be prepared to conduct survivability tasks.
  FRONTAL PURSUIT
  7-12. In a frontal pursuit, units employ a single force to maintain direct pressure on the fleeing enemy along
  the same routes used by that enemy. Commanders choose this option in two situations. The first is when they
  cannot create a subordinate force with a sufficient mobility advantage to get behind a retrograding enemy
  force. The second is when they cannot provide enough resources to the force conducting the encirclement to
  allow that force to survive and sustain itself until achieving linkup with the direct pressure force. Either
  situation can occur because of restrictive terrain or because an enemy force withdraws in a disciplined,
  cohesive formation and still has significant combat power. Figure 7-1 depicts a frontal pursuit.
  Figure 7-1. Frontal pursuit
  COMBINATION PURSUIT
  7-13. In the combination pursuit a direct pressure force and an encircling force work together to destroy the
  enemy. The direct pressure force normally conducts a series of attacks to slow the enemy force’s retirement
  by forcing the enemy force to stand and defend. In the combination pursuit, the force providing direct pressure
  initiates a frontal pursuit immediately on discovering the enemy force fleeing from the battlefield. This slows
  the tempo of the enemy force’s withdrawal (or fixes the enemy force in its current position if possible) and
  may destroy the enemy’s rear security force. By maintaining constant pressure, the force providing direct
  pressure helps to maintain conditions necessary for the success of the force conducting the envelopment
  operation. This latter force advances or flies along routes parallel to the fleeing enemy force. If the encircling
  force cannot outdistance the enemy force to cut the enemy force off, the encircling force may also attack the
  flank of a fleeing enemy force. The force conducting the encircling operation conducts an envelopment or a
  turning movement to position itself where it can block the enemy force’s escape and trap the enemy force
  between the direct pressure force and the encircling force. Figure 7-2 on page 7-4 depicts a combination
  pursuit.