3-13. A defensive operation is an operation to defeat an enemy attack, gain time, economize forces, and develop conditions favorable for offensive or stability operations. Normally the defense cannot achieve a decisive victory. However, it sets conditions for a counteroffensive or a counterattack that enables forces to regain the initiative. Defensive operations are a counter to an enemy offensive action, and they seek to destroy as much of the attacking enemy forces as possible. They preserve control over land, resources, and populations, and retain key terrain, protect lines of communications, and protect critical capabilities against attack. Commanders can conduct defensive operations in one area to free forces for offensive operations elsewhere. (See ADP 3-90 for a detailed discussion of the defense.)