Is it farther or further?
1859, "action of barring; man-made barrier in a stream," from French barrer "to stop," from barre "bar," from Old French barre (see bar (n.1)). Artillery sense is 1916, from World War I French phrase tir de barrage "barrier fire" intended to isolate the objective. As a verb by 1917. Related: Barraged; barraging.