Then follows a simple but sufficient diagram of the Confederate impregnable position, where, with only common printer's type, and the "daggers" of punctuation standing for Blakesley and Armstrong guns, printer's ink told the story. Though nearly exhausted by his manifold labors of brain and muscle, Carleton, on the 15th, visited the battle-field, which did not exceed one hundred acres, and the city in which the troops were quietly quartered, but in which a Confederate shell was falling every ten minutes. After surveying the near and distant scenes from the cupola of an already well-riddled house, Carleton followed the army when it withdrew to Falmouth, seeing through his glass the Confederates leaping upon the deserted entrenchments and staring at the empty town. Returning to Washington, he reviewed as usual the battle, and then returned homeward, according to his wont, for three weeks of rest and refreshment. His last letter, before leaving the front, was a noble and inspiriting plea for patience and continuance. He wrote: "The army is ready to fight, but the people are despondent. The army has not lost its nerve, its self-possession, its balance; it is more powerful to-day than it has ever been. It has no thought of giving up the contest. The cause is holy. It is not for power or dominion, but for the rich inheritance decreed by our fathers." The same bugle call of inspiration sounded from his lips and pen, when he rejoined the army on the Rappahannock, and Hooker was in command. He wrote: "The army needs several things; first, to be supported by the people at home. There is nothing which will so quickly take the strength out of the soldier as a blue letter from home, and on the other hand there is nothing which would give him so much life as a cheerful, hopeful letter from his friends. Let every one look beyond the immediate present into the years to come, and think of the inheritance he is to bequeath to his children. Let him see the coming millions of our people on this continent; let him lay his ear to the ground, and hear the tread of that mighty host which is to people the Mississippi Valley; which will climb the mountains of the West, to coin the hidden riches into gold; let him see the great cities springing up on the Pacific Coast; let him understand that this nation is yet in its youth; that this continent is to be the highway between China and Europe; let him behold this contest in its vast proportion, reaching through all coming time, and affecting the entire human race forever; let him resolve that, come weal or come woe, come life or come death, that it shall be sustained, and it will be."