TREMAIN, Henry Edwin, soldier, born in New York city, 14 November, 1840. He was graduated at the College of the city of New York in 1860 and then entered Columbia law-school. On 17 April, 1861, he enlisted in the 7th New York regiment as a private, and served through its two months' campaign about Washington, after which, on 13 July, he entered the National volunteer service as 1st lieutenant of the 2d New York fire zouaves. During the peninsular campaign he was on General Daniel E. Sickles's staff, and was in the battles of Williamsburg, Fair Oaks, and Malvern Hill. He was then transferred to General John Pope's army, and engaged at Bristow Station and the second battle of Bull Run, where he was captured while endeavoring to check a temporary panic and the rapid advance of the enemy. After several months' confinement in Libby prison he was exchanged, resumed duty on General Sickles's staff as assistant inspector-general, and was present at Fredericksburg and Chancellorsville, where he served as an aide to General Joseph Hooker. Meanwhile, on 25 April, 1863, he had been commissioned major, and was chief staff officer to General Sickles at the battle of Gettysburg. He was on General Daniel Butterfield's staff at Chattanooga, and took part in the battles of Dalton and Resaca. In 1864 he was ordered to the Army of the Potomac and served successively on the staffs of General David M. Gregg and General George Crook, participating in the cavalry battles under these officers, until the surrender of the Army of Northern Virginia. He was brevetted brigadier-general of volunteers on 30 November, 1865, and continued on duty in the Carolinas until his discharge on 29 April, 1866. General Tremain then resumed his law studies and was graduated in 1867, after which he entered into practice, forming in 1868 the firm of Tremain and Tyler. From 1870 till 1885 he was usually retained either by or against the government in its legal controversies in New York, and he was connected with the Marie-Garrison litigation involving the title to the Missouri Pacific railroad. He has been active as a Republican in political canvasses, and for five terms, beginning in 1871, he has been president of the associate alumni of the College of the city of New York. On 19 April, 1887, he was elected colonel of the veterans of the 7th regiment, the oldest organization of its kind in this country. His campaign notes of "Last Hours of Sheridan's Cavalry" were edited by John Watts de Peyster (1885).