text: Fire Support in Depth During Large-Scale Combat Operations
  * Ensure TA resources adequately set conditions at breach site prior to the arrival of the main body.
  Correctly identifying where to penetrate, suppress and obscure, and communicating that
  information quickly, is imperative.
  * Predict likely enemy locations, and plan on-call fires accordingly.
  * Plan for the shifting of priority of fires to the support force, then to the assault force. Establish the
  triggers.
  GAP CROSSING
  6-143. Corps and divisions can be expected to conduct gap crossings as part of offensive and defensive
  operations. Like the passage of lines, gap crossings are usually implied tasks rather than primary missions.
  Gap crossings involving corps and divisions present several challenges to be overcome, particularly in the
  area of FS. The six phases of a gap crossing are discussed below.
  * Set the Conditions (Phase I). This phase consists of all planning and continued fires targeting
  operations in the deep, close, and support areas designed to defeat deep and close enemy forces to
  synchronize one or more gap-crossing operations with all warfighting function capabilities across
  all domains.
  * Advance to the gap (Phase II). The second phase is the attack to seize objectives that secure the
  nearside terrain, which offers favorable crossing sites and road networks and provides enough area
  to stage crossing forces while preventing congestion and an undesirable massing of assets.
  * Assault across the gap (Phase III). The third phase involves units assaulting across the gap to seize
  the far side objective, eliminating direct fire into the crossing sites.
  * Advance from the far side (Phase IV). The fourth phase is the attack to secure the exit bank and
  intermediate objectives that eliminates direct and observed indirect fires into the crossing area.
  * Secure the bridgehead line (Phase V). The fifth phase includes the tasks necessary to secure
  bridgehead objectives, defeating any enemy counterattacks. This gains the necessary time and
  space for the buildup of forces for the attack out of the bridgehead.
  * Continue the attack (Phase VI). The sixth phase is the attack out of the bridgehead to defeat the
  enemy at a subsequent or final objective. It is considered as a phase of the gap crossing because
  the timing and initiation of this phase are typically dependent on the success of the other five
  phases of the gap crossing.
  6-144. Commanders must plan to quickly cross whatever rivers or streams are in the path of advance. A
  wet-gap crossing requires special planning and support. The size of the obstacle and the enemy situation will
  dictate how to make the crossing. Attackers should strive to cross rivers without loss of momentum regardless
  of how they get across. The planning requirements for each type of gap crossing are similar. However, the
  required degree of detail and necessary conditions for a high degree of success will vary based on the type
  and the unique features associated with a crossing mission. For more information on gap crossing see, ATP
  3-90.4. The gap crossing types:
  * Deliberate crossing is the crossing of an inland water obstacle or other gap that requires extensive
  planning and detailed preparations (ATP 3-90.4). It requires the use of rafting (nonbridging) and
  bridging assets. The use of assault craft, rafting, or ferries and the emplacement of bridging assets
  may occur sequentially or concurrently. The objective in deliberate wet-gap crossings is to project
  combat power to the exit bank of a river or other type of significant water obstacle at a faster rate
  than the enemy can concentrate forces for a counterattack. Typically, wet-gap crossings are one
  of the most difficult types. They generally require significant augmentation of mobility support
  assets.
  * Hasty crossing is the crossing of an inland water obstacle or other gap using the crossing means
  on hand or those readily available, and made without pausing for elaborate preparations (ATP 3-
  90.4). Hasty gap crossings are usually focused on a combined arms activity to project combat
  power across a terrain feature (wet or dry) that can be overcome by self-bridging assets within the
  BCT. These assets may be organic, provided to the BCT as augmentation, or found as expedient
  crossing materials within the AO. Typically, a hasty gap crossing is a gap that is 65 ft or less in
  width. They are normally accomplished with tactical bridging. A hasty gap crossing may also
  include support bridging and the use of expedient bridging or gap crossing by other means.