The writer of this book was a volunteer officer in the Union army throughout the war of the Great Rebellion, and his service was in the field. The book, having been written while the author was engaged in a somewhat active professional life, lacks that literary finish which results from much pruning and painstaking. He, however, offers no excuse for writing it, nor for its completion; he has presumed to nothing but the privilege of telling his own story in his own way. He has been at no time forgetful of the fact that he was a subordinate in a great conflict, and that other soldiers discharged their duties as faithfully as himself; and while no special favors are asked, he nevertheless hopes that what he has written may be accepted as the testimony of one who entertains a justifiable pride in having been connected with large armies and a participant in important campaigns and great battles.