The spot where we intend to fight must not be made known; for then the enemy will have to prepare against a possible attack at several different points; and his forces being thus distributed in many directions, the numbers we shall have to face at any given point will be proportionately few.

Sun Tzu's The Art of War: Bilingual Edition Complete Chinese and English Text (ed. Tuttle Publishing, 2012) - ISBN: 9781462905126