What is a defensive operation that concentrates on the destruction or defeat of the enemy through a decisive attack by a striking force?

A mobile defense is indeed characterized by its focus on the destruction or defeat of the enemy through a decisive attack by a striking force. In this type of operation, the defending force does not solely rely on fortified positions or static defenses. Instead, they actively engage and maneuver to exploit enemy weaknesses, often withdrawing to lure the enemy into vulnerable positions before launching a counteroffensive.

The key aspect of mobile defense is its dynamic nature, where the defending force maintains the ability to adapt and reposition as necessary, utilizing mobility to strike effectively at enemy forces. This operational strategy aims to envelop or decisively engage the enemy by using reserves or striking forces in a coordinated and timely manner.

This understanding distinguishes mobile defense from other concepts. Static defense emphasizes holding ground with fixed positions and is more about fortification than offensive action. Guerrilla warfare involves irregular tactics rather than conventional direct engagements, focusing on ambush and hit-and-run. Reinforced defense typically refers to augmenting a static defense rather than employing dynamic maneuver strategies. Therefore, the essence of a mobile defense as a decisive and flexible strategy aligns with the definition provided in the question.