An army ought to have only one line of operation. This should be preserved with care, and never abandoned but in the last extremity. NOTE.“The line of communication of an army,” says MontÉcuculli, “must be certain and well established, for every army that acts from a distant base, and is not careful to keep this line perfectly open, marches upon a precipice. It moves to certain ruin, as may be seen by an infinity of examples. In fact, if the road by which provisions, ammunition and reinforcements are to be brought up, is not entirely secured—if the magazines, the |