text: Chapter 7
  Figure 7-13. Identify likely enemy avenues of approach, example
  7-140. Enemy Avenue of Approach 1 and Avenue of Approach 2, within the scenario though restricted,
  support mounted movement though the terrain forward (east) of the Green and Red Rivers, thus hindering
  enemy movement to some degree. The terrain typically consists of moderate-to-steep slopes or
  moderate-to-densely spaced obstacles, such as trees or rocks. Enemy forces within this restricted area will
  have difficulty maintaining preferred speeds, moving in movement formations, and transitioning from one
  formation to another. Enemy movement will require zigzagging or frequent detours. A poorly developed road
  system will hinder the enemy’s ability to sustain its attack along both enemy avenues of approach. The
  unrestricted terrain further west from Green and Red Rivers will allow the enemy to move unimpeded along
  enemy Avenue of Approach 1 and Avenue of Approach 2 once clear of the two rivers.
  7-141. The terrain along enemy Avenue of Approach 3 (A and B),identified to the north of the Blue River
  valley,is severely restricted. Steep slopes and large or densely spaced obstacles with little or no supporting
  roads characterize the terrain. Though suitable for dismounted movement and infiltration,the terrain within
  Avenue of Approach 3 (A and B) impedes motorized Infantry and armored movement. Swamps and the
  rugged terrain within this area are examples of restricted areas for dismounted Infantry forces. The road
  system utilized to sustain the enemy’s attack is very limited along Avenue of Approach 3 (A and B). Due to
  the terrain, security patrols between battle positions will be key to impeding enemy infiltration efforts to
  division support and consolidation areas. (See ATP 2-01.3 for additional information on determining terrain
  characteristics and the terrain’s effect on operations.)