What does preparation in defense enable a commander to achieve?

Preparation in defense enables a commander to anticipate enemy actions, which is crucial for successful defensive operations. Effective defense relies on understanding the potential tactics and maneuvers that an adversary might employ. By preparing well, a commander can analyze the enemy's likely courses of action and develop contingency plans to counter those actions. This proactive approach allows for better decision-making in real-time scenarios, enhancing situational awareness and enabling the commander to leverage their forces effectively in response to enemy movements.

While the other options highlight important aspects of military operations, they do not encapsulate the comprehensive advantage gained through defensive preparation as effectively as anticipation of enemy actions. Adequate troop rest is vital for troop readiness but pertains more to logistics than direct preparation for engagement. Effective strategic planning is indeed important but encompasses broader aspects beyond the specific context of defense preparation. Resource reallocation is essential for operational efficiency but is primarily a logistical concern rather than a direct tactical advantage gained from preparation in defense.