ADP 3-90, page 69

The Defense 31 July 2019 ADP 3-90 4-9 synchronize information-related capabilities to achieve these objectives and create specific effects. Commonly synchronized information-related capabilities to support the defense include cyberspace operations, electronic warfare, military deception, military information support operations, and operations security. MOVEMENT AND MANEUVER 4-50. Defending commanders seek to defeat the attacks of enemy forces by attriting those forces with repeated, unexpected engagements before they conduct their final assaults on friendly defensive positions. Enemy forces attempt to withdraw or transition to the defense in the face of friendly counterattacks once their attacks fail. If an enemy force succeeds in overrunning a key defensive position, that defending friendly unit counterattacks to restore defensive integrity before that enemy force can either organize that position for defense or exploit its success. Exploit the Advantages of Terrain 4-51. Defending commanders exploit the advantages of occupying the terrain where an engagement will occur. A defending force engages an attacker from locations that give that defending force an advantage. Defensive positions in the MBA make use of existing and reinforcing obstacles. Commanders may shape the battlefield by defending in one area to deny terrain to an enemy force while delaying in another area. This is to deceive an enemy commander into believing that an attacking enemy force has achieved success. 4-52. Generally, defending forces have the advantage of preparing the terrain by reinforcing natural obstacles, fortifying positions, and rehearsing operations. (See ATP 3-90.8 for guidance on integrating obstacles into engagement areas and defensive positions.) 4-53. Terrain features that favor the defense include—  A series of parallel ridges across the line of hostile advance.  Unfordable streams, swamps, lakes, and other obstacles on the front and flanks.  High ground with good observation and long-range fields of fire.  Concealed movement routes immediately behind defensive positions.  A limited road network in front of the line of contact to confine an enemy force to predictable avenues of approach.  A good road network behind the line of contact that allows commanders to reposition forces as a battle progresses. 4-54. Depending on the mission variables, units can conduct survivability moves between their primary, alternate, and supplementary positions. A survivability move is a move that involves rapidly displacing a unit, command post, or facility in response to direct and indirect fires, the approach of a threat or as a proactive measure based on intelligence, meteorological data, and risk assessment of enemy capabilities and intentions. A survivability move includes those movements based on the impending employment of weapons of mass destruction. Disrupt the Enemy Attack at Every Opportunity 4-55. The defending force conducts operations in multiple domains to disrupt an enemy commander’s plan and destroy key units and assets. Particularly the defending force seeks to degrade enemy forces’ command and control capabilities and integrated fires complex as well as to destroy their reserve. This compels early enemy culmination and allows the defending force to regain the initiative. The defending force conducts spoiling attacks to disrupt enemy troop concentrations and attack preparations. The defending force rapidly counterattacks an enemy success with its reserve, the forces at hand, or a striking force before the enemy force can exploit that success. Mass the Effects of Combat Power 4-56. The decisive operation can be tied to a geographical location or against an enemy force. In an area defense, defending units use engagement areas to concentrate combat power from mutually supporting