The following Diary covering the interesting period of the Civil War from January 1, to December 31, 1864, and a portion of 1865 to the surrender of General R. E. Lee at Appomattox Court House, Va., was kept by the Author at the age of twenty-two when an officer of the Tenth Regiment Vermont Volunteer Infantry, Third and First Brigade, Third Division, Third and Sixth Corps respectively, Army of the Potomac, and is a brief war history as seen by a young soldier literally from the front line of battle during General U. S. Grant's celebrated campaign from the Rapidan River to Petersburg, Va., and Gen. P. H. Sheridan's famous Shenandoah Valley campaign in the summer and fall of 1864. During this time the Author passed from the grades of Second to First Lieutenant and Captain, and commanded in the meantime in different battles five or more companies in his regiment which afforded an excellent opportunity to make a fairly interesting general diary of the fighting qualities of his regiment and especially of the companies which he commanded during that most interesting period of the Civil War when the backbone of the Rebellion was broken, which, together with Sherman and Thomas' cooperations led to the surrender of General R. E. Lee at Appomattox C. H. April 9, 1865.