text: Chapter 4
  it to division commanders. Division commanders retain authority unless a higher commander withholds or
  restricts it.
  ENGINEER SUPPORT TO THE CORPS
  Corps engineers aid in the disruption of the enemy attack throughout the depth of the AO. The corps
  engineer works closely with the corps staff to ensure that engineer disciplines are integrated into deep, close,
  support, and consolidation areas.
  The engineer effort in support of deep operations includes providing terrain visualization and
  identifying enemy AAs. It also includes planning and executing situational obstacles to disrupt enemy forces.
  These forces may include committed, reserve, or follow-on enemy units.
  In close areas, engineers shape EAs by integrating the effects of obstacles with direct and indirect fires.
  Engineers plan, coordinate, and synchronize survivability to support protecting friendly forces. Finally, they
  allocate mobility assets to the counterattack force.
  In support areas, Engineers ensure the survivability of C2 facilities by hardening key and critical
  infrastructure and creating protective barriers. They strengthen base and base camp defenses. Engineers also
  maintain LOCs and facilities.
  ENGINEER SUPPORT TO THE DIVISION
  A significant consideration for the division echelon is ensuring that subordinate BCTs conducting
  defense operations provide adequate additional combat and general engineering capabilities to meet the
  requirements. The division echelon must balance the availability of combat and general engineering
  capabilities against extensive requirements in support of the protection and movement and maneuver
  warfighting functions. Typically, these assets are task-organized in support relationships to optimize their
  availability. An exception is that some general engineering units may be task-organized in a command
  relationship to a combat engineering unit or an engineer headquarters unit to facilitate integration into the
  combined arms team.
  Divisions in the defense generally take one of two traditional patterns: mobile defense and area defense.
  The fundamental difference between these patterns is their focus-and-defeat mechanism. The scheme of
  engineer operations to support the division in the defense is tailored to the type of defense used. The focuses
  of engineer efforts, unit missions, and task organization are all inseparably linked to the focus-and-defeat
  mechanism of each type of defense. Therefore, the division engineer must understand the area and the mobile
  defense and their implications on engineer functions and unit operations.
  BRIGADE COMBAT TEAM SUPPORT
  The brigade engineer echelon provides a critical function in supporting the defense. As with offense
  operations, the ultimate goal is to integrate and synchronize engineer operations with other warfighting
  functions. Maneuver and engineer commanders must understand the relationship between maneuver planning
  and obstacle integration. The brigade commander’s intent for obstacle and survivability operations provides
  the impetus for directing the engineer effort. The engineer estimate process is the base planning tool for
  integrating into brigade defensive operations plans. While the process remains the same, each step is tailored
  to the needs of defensive operations planning. See ATP 3-34.22 and ATP 3-90.8 for more information on
  BCT echelon engineer defense planning.
  ENGINEER SUPPORT TASKS TO CONSOLIDATE GAINS
  Consolidate gains are the activities to make enduring any temporary operational success and to set the
  conditions for a sustainable security environment, allowing for a transition of control to other legitimate
  authorities (ADP 3-0). Commanders continuously consider activities necessary to consolidate gains and
  achieve the end state. Consolidate gains is integral to winning armed conflict and achieving enduring success.
  It is essential to retain the initiative over determined enemies because it ultimately removes their capability
  and will for further resistance. It is the final exploitation of tactical success. Engineer forces, when supporting