It has been pointed out that von Clausewitz does not use the exact phrase "fog of war," and also uses multiple similar metaphors, such as "twilight" and "moonlight", to describe a 'lack of clarity'.[3] The first known use of the exact phrase in text dates to 1896 in a book titled The Fog of War by Sir Lonsdale Augustus Hale, where it is described as "the state of ignorance in which commanders frequently find themselves as regards the real strength and position, not only of their foes, but also of their friends."[4]