" If it was not intended as a veto, then it must have been intended for commanders to interpret as they saw fit, which brings the matter to that melting point of warfare—the temperament of the individual commander.
When the moment of live ammunition approaches, the moment to which all his professional training has been directed, when the lives of men under him, the issue of the combat, even the fate of a campaign may depend upon his decision at a given moment, what happens inside the heart and vitals of a commander? Some are made bold by the moment, some irresolute, some carefully judicious, some paralyzed and powerless to act. "
― Barbara W. Tuchman , The Guns of August