What is the primary objective of defense in depth?

The primary objective of defense in depth is to make defense harder to penetrate by utilizing a layered approach to defensive operations. This strategy involves establishing multiple defensive positions and obstacles, which can slow down and potentially disrupt the advance of an enemy. Each layer of defense can absorb pressure from the attacking forces, allowing for countermeasures to be employed effectively while protecting vital assets behind the frontline. This method enhances overall security by ensuring that even if one layer is compromised, additional layers remain to defend key positions.

The focus on using every asset means integrating different types of forces and equipment, such as infantry, artillery, and fortifications, to create a robust and multifaceted defense. This complexity can confuse and overwhelm attackers, forcing them to expend more resources and time overcoming each obstacle in succession.

In contrast, concentrating forces at one point would leave other areas vulnerable, minimizing flexibility. Minimizing resource use does not align with the tenet of defense in depth, which often requires a significant investment in a variety of defensive measures. Lastly, retreating and regrouping is typically considered a tactical maneuver rather than a fundamental approach to establishing a defensive posture.