text: Appendix A
  in the offense. Commanders draw it where the direct fires of forward combat elements of the stationary unit
  can effectively support the passing unit until completion of the passage of lines. The area between the BHL
  and the stationary force belongs to the stationary force commander. The stationary force commander may
  employ security forces, obstacles, and fires in the area. Figure A-27 depicts a BHL at PL DANIEL used in
  conjunction with other control measures during a forward passage of lines.
  Figure A-27. Battle handover line DANIEL
  Direction of Attack
  A-51. The direction of attack is a specific direction or assigned route a force uses and does not deviate from
  when attacking (ADP 3-90). It is a restrictive control measure that requires a subordinate unit to attack as
  indicated and is not normally allowed to bypass the enemy. It is normally used at battalion and lower levels.
  Direction of attack is a more restrictive control measure than axis of advance and units are not free to
  maneuver off the assigned route. Direction of attack is normally used in counterattacks or to ensure that
  supporting attacks make maximal contribution to the main attack. It is also used during night attacks,
  infiltrations, and when attacking through obscuration. When using a direction of attack, commanders
  designate a PD at the beginning. Figure A-25 on page A-14 depicts DIRECTION OF ATTACK JOAN.
  Final Coordination Line
  A-52. The final coordination line is a phase line close to the enemy position used to coordinate the lifting or
  shifting of supporting fires with the final deployment of maneuver elements (ADP 3-90). Brigade and below
  maneuver formations typically use an FCL. The FCL should be placed on easily recognizable terrain. Final
  adjustments to supporting fires necessary to reflect the actual versus the planned tactical situation take place
  before crossing the FCL. The FCL is not a FSCM. Figure A-25 on page A-14 depicts PL ROBERT as an
  FCL.