text: Attack
  Figure 5-7. Example of an L-shaped ambush
  5-113. An area ambush is most effective when enemy movement is largely restricted to trails or roads.
  Figure 5-8 on page 5-22 is a sketch of an area ambush. The area should offer several suitable point ambush
  sites. Units select a central ambush site around which to organize outlying ambushes. They determine the
  enemy force’s possible avenues of approach and escape routes once they select the central ambush site.
  Commanders assign outlying point ambush sites to subordinates to cover these avenues. Friendly ambushing
  forces report all enemy traffic going toward or away from the central ambush site to their higher headquarters
  after those forces occupy those outlying sites. These outlying ambushes allow enemy elements to pass
  through their kill zones until their commanders initiate their central ambush. Once the central ambush begins,
  these outlying ambushes prevent enemy troops from escaping or entering the area.