As the writer looked up from the manuscript page on a warm March afternoon of 1862, a very busy, and occasionally an amusing scene was presented. I was seated on a gentle, wooded slope which led down to the clear and quiet stream of Stone River, in Tennessee. Not being at that time "on duty," I had strolled away from the tents which whitened the level fields above, and was passing an hour in the pleasant task of preparing "war correspondence" for the _Steubenville Herald_. Now and then I lifted my eyes to watch the work in progress a few yards farther down the stream. A large bridge, burned by the enemy on their retreat a few weeks before, was now being rapidly repaired, or rather rebuilt. The chief director of the work was General O. M. Mitchel, of astronomical fame, in whose division I then served. He was in every respect an able officer, and understood the construction of railroad bridges as well as observing the stars, or moulding raw recruits into veteran soldiers. But all his skill and science did not save him from becoming a little ridiculous at times. The Union soldier found no difficulty in loving his commander and laughing at him at the same instant. General Mitchel was now most impatient to complete this bridge, and thus maintain a northern line of communication, while he penetrated farther into the South. Being now, for the first time, possessed of an independent command, he wished to signalize himself by some great blow struck at the most vulnerable point in the enemy's line. He could, therefore, scarcely endure the necessary delay caused by burnt bridges, and worked like a beaver, and chafed and fretted, and caused the men of his command to perform more hard labor than was agreeable. As I saw him running from place to place, urging on the idlers, and taking hold of any piece of work that presented itself as if he had been a common laborer, shouting and scolding, but always knowing just what ought to be done, and making surprising progress, I could not help admiring the man, even while I laughed at some exhibitions of superfluous zeal. Mitchel's scientific education, his practical experience, and his inventive genius stood him in good stead, as was proved by the rapid growth of the bridge before me. The soldiers almost idolized their skilful and zealous commander, but this did not deprive them of the soldier's privilege of grumbling without stint at his restless activity. He was to be found along the guard lines at almost any hour of the night, and woe to the sleepy sentinel who failed to give the proper challenge or to "turn out" promptly. No severe punishments had yet been inflicted, but some of the indolent had been terribly frightened, and were accustomed to declare that "Old Mitchel" had been watching the stars so long that he could not sleep at night himself, and was not willing that anybody else should! But the discipline of the troops steadily improved, and the hearty