Harper's Ferry, a town supported of old almost entirely by the arsenal works, is a desolate little stronghold among towering mountains, the ruins being in the foreground. The precipices on either side of the river belong to the Elk Ridge, through which, at some antediluvian period, the colossal current has hewed its way. At the base of the Virginia side of the mountains, hugged in by the Potomac and Shenandoah Rivers, and by Loudon and Bolivar Heights, cowers the town. [Illustration: BATTLE-GROUNDS OF THE POTOMAC VALLEY.] Across the river towers the mighty cupola of Maryland Height, far overtopping the other peaks, and farther down the stream, like a diminishing reflection of it, the softer swell of South Mountain. An ordinary rifle-cannon on Maryland Height can with the greatest ease play at bowls to the other summits. From this eminence one Colonel Ford, on September 13, 1862, toppled down his spiked and coward cannon: the hostile guns of the enemy quickly swarmed up the summit he had abandoned, and the Virginia crests of Loudon and Bolivar belched with rebel artillery. The town was surrendered by Colonel Miles at the very moment when McClellan, pressing forward through the passes of South Mountain from Frederick, was at hand to relieve it: Miles was killed, and the considerable military stores left in the village were bagged by Stonewall Jackson. Flushed with this temporary advantage, Jackson proceeded to join Lee, who then advanced from Sharpsburg and gave unsuccessful battle to the Union forces at Antietam Creek.