What military strategist, writing about irregular warfare, declared "the skillful leader subdues the enemy's troops without any fighting; he captures their cities without laying siege to them; he overthrows their kingdom without lengthy operations in the field"?

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The quote is a famous one from the ancient Chinese military strategist Sun Tzu, specifically from his book "The Art of War." The other three options were all European military strategists who wrote about warfare but did not specifically focus on irregular warfare or guerrilla tactics.

What Military Strategist, Writing About Irregular Warfare, Declared "The Skillful