From Santa Fe to Fort Union, where the arsenal was located, the road runs through the deep, rocky gorge known as Apache Canyon. It is one of the wildest spots in the mountains, the walls on each side rising from one to two thousand feet above the Trail, which is within the range of ordinary cannon from every point, and in many places of point-blank rifle-shot. Granite rocks and sands abound, and the hills are covered with long-leafed pine. It is a gateway which, in the hands of a skilful engineer and one hundred resolute men, can be made perfectly impregnable. The Atchison, Topeka, and Santa Fe Railway passes directly through this picturesque chasm, every foot of which is classic ground, and in the season of the mountain freshets constant care is needed to keep its bridges in place. At its eastern entrance is a large residence, known as Pigeon's Ranch, from which the battle to be described derives its name, though, as stated, it is also known as that of Apache Canyon, and La Glorieta,[39] the latter, perhaps, the most classical, from the range of mountains enclosing the rent in the mighty hills. The following detailed account of this battle I have taken from the _History of Colorado_,[40] an admirable work: The sympathizers with and abettors of the Southern Confederacy inaugurated their plans by posting handbills in all conspicuous places between Denver and the mining-camps, designating certain localities where the highest prices would be paid for arms of every description, and for powder, lead, shot, and percussion caps. Simultaneously, a small force was collected and put under discipline to co-operate with parties expected from Arkansas and Texas who were to take possession, first of Colorado, and subsequently of New Mexico, anticipating the easy capture of the Federal troops and stores located there. Being apprised of the movement, the governor immediately decided to enlist a full regiment of volunteers. John P. Slough was appointed colonel, Samuel F. Tappan lieutenant-colonel, and John J. M. Chivington major. Without railroads or telegraphs nearer than the Missouri River, and wholly dependent upon the overland mail coach for communication with the States and the authorities at Washington, news was at least a week old when received. Thus the troops passed the time in a condition of doubt and extreme anxiety, until the 6th of January, 1862, when information arrived that an invading force under General H. H. Sibley, from San Antonio, Texas, was approaching the southern border of New Mexico, and had already captured Forts Fillmore and Bliss, making prisoners of their garrisons without firing a gun, and securing all their stock and supplies.