Single Line of Operations

—An army moving in a given direction with all its parts united, or with those parts so situated that they can be readily joined when required, is said to use a “single line of operations.” Sometimes this line is called a simple line. A single line of operations does not mean a single road , but embraces all the roads or routes taken by the fractions of the army for the purpose of reaching a common point of concentration; the condition being imposed that these roads shall not be so far apart, or have intervening such obstacles, that the different parts of an army will be prevented from uniting at any given time which may be appointed.