The beautiful and brand new 188-foot 1,300-ton U.S. Army Mine Planter No. 16, Col. George W. Ricker, at New Orleans’s Pauline Street Wharf, 14 May 1943. She arrived at the New Orleans Port of Embarkation from Point Pleasant, West Virginia, on 11 May 1943 from her builder, Marietta Manufacturing Co. She only served the Army for a year before the Navy picked her up and commissioned her as the Minesweep Gear and Repair Ship, USS Planter (ACM 2), in April 1944. Struck from the Naval Register on 23 December 1947, she was sold to commercial interests and was still in use as a fishing trawler into the 1970s. Official U.S. Army Photograph 298-1-43 via the WWII Museum.
Lost in the sauce when it comes to U.S. mine warfare in World War II is the Army’s sea mine planting efforts during the conflict.
Brainstormed by the Army as early as 1866 from experience gained against Confederate “torpedoes” in the Civil War, by 1876 an experimental defensive minefield was sown at Fort Mifflin in Pennsylvania. This led to an explosion (pun intended) in floating Army minefields during the Endicott Period of coastal defense.
By the Spanish-American War, at least 28 harbors and coastal chokepoints had Army-controlled electric submarine mines installed.
Mine 1919 Fort Pickens, outside of Pensacola. Typically 45 mines in seven groups were planted there between 1917-18
This only continued to grow and, after Army sea mines were transferred from the Corps of Engineers to the Artillery Corps, leading to the dedicated Coast Artillery Corps in 1907, the branch even kicked off an Army Mine Planter Service in 1918. At least 37 large planters, typically named after colonels and generals, were used by the AMPS during this period as well as twice as many “junior mine planters”, or “pup planters.”
Army-controlled submarine nets, mines, and shore batteries protected the entrance to San Francisco Bay May 1942 Ft. Cronkite. Of note, Fort Funston with its modern 16-inch guns, is not listed
By the time WWII came, the Coastal Artillery controlled 27 Harbor Defense Commands with minefields, at least five of them overseas in Hawaii, the Canal Zone, Puerto Rico, and the Philippines. Speaking of which, USAMP Col. George F.E. Harrison and USAJMP Neptune sowed Army minefields at Manila Harbor in 1941 to help block the Japanese advance. Both planters were sunk during the Luzon campaign, with Harrison earning a Navy battle star.
The 704-ton, 172-foot USAMP Col. George F.E. Harrison moored pierside at Ilollo, Panay, Philippine Islands, 2 February 1933. Sunk by Japanese dive bombers in May 1942, she was later raised and would serve as the Japanese Imperial Navy cable ship IJN Harushima, only to be sent to the bottom again, this time by American dive bombers, in 1945. U.S. Army Signal Corps photo # 331549, U.S. National Archives 111-SCA-Album-2986.
On 7 December 1941, the Army had approximately 5,000 controlled mines on hand for harbor defense and during the war would sow 7,320 (3,569 contact and 3,751 magnetic) domestically along with 1,847 mines ex-CONUS.
That doesn’t even count the no less than 12,000 air-dropped offensive mines laid by the USAAF in the Pacific during the war, which is a whole different story.
Operation Starvation. Loading aerial mines on a B-29 of the 468th Bomb Group, 24 January 1945. (NARA)
Via Navweaps:
By 1945, the Army Air Force was devoting considerable resources to the mining role, with 80 to 100 B-29s based at Tinian being used to mine the home waters around Japan. These B-29s could carry seven 2,000 lbs. (907 kg). or twelve 1,000 lbs. (454 kg) mines. “Operation Starvation” started in March 1945 and continued until early August with 4,900 magnetic, 3,500 acoustic, 2,900 pressure, and 700 low-frequency mines being laid. These mines sank 294 ships outright, damaged another 137 beyond repair, and damaged a further 239 that could be repaired. In cargo tonnage, the total was 1.4 million tons lost or damaged which was about 75% of the shipping available in March 1945.
With the Army’s airborne minedropping capability going in 1947 to the newly established USAAF (which still maintains the little talked about skillset), and the disbandment of the Coastal Artillery branch soon after, when the defunct AMPS was fully zeroed out on paper on 22 January 1954– 70 years ago today– it closed the Big Green’s 88-year run with sea mines.
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