Background
ERNST, O. H. was born on June 27, 1842 in near Cincinnati, Ohio, United States. Son of Andrew H. and Sarah Otis Ernst.
ERNST, O. H. was born on June 27, 1842 in near Cincinnati, Ohio, United States. Son of Andrew H. and Sarah Otis Ernst.
Studied at Harvard College. United States Military Academy at West Point.
Commissioned First Lieutenant, Corps of Engineers, 1864. Served as Assistant Chief Engineer, Army of the Tennessee, to close of Atlanta campaign. As astronomer with the Commission sent by United States Government to Spain to observe solar eclipse of December 1870.
As instructor of practical military engineering and military signalling and telegraphy at United States Mili- y_ tary Academy, 1871-1878.
In charge of improvement of Mississippi river and other western rivers, 1878-1886. Also of harbour at Galveston, and other harbours on Texas coast, 1880-1869.
Aide-de-camp to President Harrison, 1889-1893. Superintendent, United States Military Academy, 1893-1898.
In command of 1st Brigade, 1st Division., 1st Corps in the war with Spain.
Inspector-General of Cuba, 1898-1899. Member of Commission to investigate the Isthmus connecting North and South America, with a view to the construction of an inter - oceanic canal, 1899-1903. Division Engineer North.-West Division, 1901-1905.
President Mississippi River Commission, 1903-G. Member of the Isthmian Canal Commission, 1905-1906.
Member of numerous Boards of Engineers, 1880-1906. Brigadier-General United States Army, retired. Member of International Commission to investigate the condition of the waters adjacent to the boundary lines between the United States and Canada.
Clubs: Metropolitan, Chevy Chase.