A military operation involves deception. Even though you are competent, appear to be incompetent. Though effective, appear to be ineffective.

Sun-tzu (~400 BC), The Art of War. Strategic Assessments

Sun Tzu (c. 544 – 496 BC) was a Chinese author of The Art of War, an immensely influential ancient Chinese book on military strategy. He is also one of the earliest realists in international relations theory. The name Sun Tzu ("Master Sun") is an honorific title bestowed upon Sun Wu, the author's name. The character wu, meaning "military", is the same as the character in wu shu, or martial art. Sun Wu also has a courtesy name, Chang Qing ... +