Laudator Temporis Acti

Ambrose Bierce (1842-1914?), "The Crime at Pickett's Mill," Iconoclastic Memories of the Civil War: Bits of Autobiography (Girard: Haldeman-Julius Company, 1909), pp. 17-30 (at 18-19):

The civilian reader must not suppose when he reads accounts of military operations in which relative position of the forces are defined, as in the foregoing passages, that these were matters of general knowledge to those engaged. Such statements are commonly made, even by those high in command, in the light of later disclosures, such as the enemy's official reports. It is seldom, indeed, that a subordinate officer knows anything about the disposition of the enemy's forces—except that it is unamiable—or precisely whom he is fighting. As to the rank and file, they can know nothing more of the matter than the arms they carry. They hardly know what troops are upon their own right or left the length of a regiment away. If it is a cloudy day they are ignorant even of the points of the compass. It may be said, generally, that a soldier's knowledge of what is going on about him is coterminous with his official relation to it and his personal connection with it; what is going on in front of him he does not know at all until he learns it afterward.