Final answer:
The Principle of War that emphasizes the importance of achieving victory by capturing the enemy's army or regiments.
Step-by-step explanation:
The Principle of War that states that success in war is generally attained only while on the offensive is the principle of Attack by Stratagem. Sun Tzu, an ancient Chinese military strategist, emphasized the importance of avoiding destruction and instead focusing on achieving victory by capturing the enemy's army or regiments. This principle highlights the significance of outmaneuvering the opponent and seizing favorable opportunities.