John Gray Foster was an American soldier. A career military officer in the United States Army and a Union general during the American Civil War, he served in North and South Carolina during the war. A reconstruction era expert in underwater demolition, he wrote a treatise on the subject in 1869. He continued with the Army after the war, using his expertise as assistant to the Chief Engineer in Washington, DC and at a post on Lake Erie.
Portrait of John Foster by Mathew Brady, c. 1863
Underwater demolition is the deliberate destruction or neutralization of man-made or natural underwater obstacles, both for military and civilian purposes.
Sir Charles Pasley
The submarine explosion of the large cylinder containing 2300 lbs of Powder against the wreck on 23 September 1839