Clark graduated from the
Naval Academy in 1863. He commanded the
Bermuda for the passage to the
Philadelphia Navy Yard, where he then reported to the
screw sloop . He stayed on the
Ossipee (which was under the command of
John P. Gillis) for the
Battle of Mobile Bay and in the bombardment of
Fort Morgan, which was all of his Civil War service. Clark was promoted to captain in 1896. In March 1898, he took command of the
battleship at the
Mare Island Naval Shipyard,
San Francisco. When war with
Spain was deemed inevitable, he received orders to proceed to
Key West, Florida, with all haste. The
Oregon, her crew, and Clark sailed from San Francisco on March 19. After a most remarkable voyage of over 14,000 miles, around
Cape Horn, he joined the American fleet in
Cuban waters on May 26. The voyage of the
Oregon was hailed a remarkable achievement in its day, and pointed to the need for the
Panama Canal to reduce travel time between the east and west coasts of the United States. On May 27, his crew was increased by sixty sailors. With a squadron of other ships;
Brooklyn,
Massachusetts,
Iowa,
Texas,
Marblehead, and
New Orleans, they set up a blockade intended to last until July. On July 3, the USS
Oregon, captained by Clark, led the chase resulting in the destruction of
Cervera's squadron. For this high accomplishment, he was advanced in seniority, and was appointed Rear Admiral 16 June 1902. Clark retired from the Navy upon reaching the mandatory retirement age of 62 in 1905. ==Later life and legacy==