[Illustration: Sketch Map showing Lee’s and Grant’s lines about Richmond and Petersburg] Still more important was the fact that Lee must stand ready, by day and by night, to defend every point on this long line, while his adversary, with the assistance of ships and railroads in his rear, could concentrate irresistible forces at any point he pleased and at any time he pleased, without the knowledge of the Confederate commander. To the military on-looker it appeared easy for Grant to break through Lee’s lines whenever he pleased, by hurling an overwhelming force with irresistible momentum against any part of the attenuated thread that he might elect, breaking through with certainty and entire ease. Such would have been the case but for the splendid fighting quality of that Army of Northern Virginia which was struggling almost literally in its “last ditch.” Time after time Grant massed his forces and threw them with all his might against the weakest points he could find in Lee’s defensive lines, only to be baffled and beaten by a fighting force that was absolutely unconquerable in its obstinate determination. But Grant had other arrows in his well-stocked quiver. His enormous superiority in numbers, and his easy ability to manœuvre beyond his adversary’s sight or ken, made it possible for him continually to extend his lines to the left; pushing south and west, and compelling Lee to stretch out his already slender line to the point of hopeless thinness. Grant could one day assail the defences below Richmond on the north side of the James River in vastly superior force, and the next morning at daybreak hurl five men to Lee’s one against the works defending the Weldon Railroad, thirty miles or more to the south. Yet even under these conditions the brilliant Confederate strategist not only held his own, but detached from his all too meagre force a strong column under Early, and sent it to sweep the valley of Virginia, invade Maryland, and so far threaten Washington as to compel Grant either to send forces for the defence of the Federal capital or to forego for the time being the reinforcements which he was clamorously demanding for the strengthening of his lines at Petersburg. Captain Marshall Pollard’s battery was included in the detail of troops made for this final and despairing invasion of the country north of the Potomac; and when the battery marched, Sergeant-major Owen Kilgariff rode by the side of his captain, ready for any duty that might fall to his lot. The wound in his neck was not yet well, or even nearly so, but he was quite regardless of self in his eagerness to bear his part, and so, in spite of all the warnings of all the doctors, he had rejoined his command at the first moment in which he was strong enough to sit upright in the saddle.