Battery 405

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Battery 405 (1944-1945) - Battery 405 was a reinforced concrete, World War II 8 inch coastal gun battery on Fort Hase, Honolulu County, Hawaii. Battery construction started in early 1943, was completed in early 1944 at an estimated cost of $ 283,850. Known as Battery 405 during the war after the construction number BCN 405. After the war renamed Battery Robert E. DeMerritt by G.O. 96, 27 Aug 1946. Placed in caretaker status in 1945.

World War II

8" Mark VI M3A2 Gun and M1 Carriage from TM 9-442

Part of the Harbor Defense of Kaneohe Bay.

Originally built as a World War II concrete coastal gun battery with two 8" Mark VI M3A2 guns mounted on M1 Barbette Carriages (BC) placed on a hillside with the magazines built into tunnels. Power was supplied by internal generators and commercial power.

Battery 405 Armament (edit list)
Model Serial
Manufacturer Carriage Service
1 8" Rifle 369" Mark VI M3 A2 212 Naval Gun Factory Barbette, M1, # 15, Aberdeen 1944-1945 See note 1
2 8" Rifle 369" Mark VI M3 A2 218 Naval Gun Factory Barbette, M1, # 16, Aberdeen 1944-1945 See note 1
Source: CDSG, Berhow, Mark A. ed, American Seacoast Defenses: A Reference Guide, 2nd Edition, CDSG Press, McLean, VA, 2004, ISBN 0-9748167-0-1, pages 114-115
Note 1: CDSG Gun Card Collection from NARA, The serial numbers assigned to specific emplacements may not be correct.
Battery 405 Plan (a cleaned up copy of a very bad original)

Current Status

No period guns or mounts in place.

Location: Fort Hase, Honolulu County, Hawaii

Maps & Images

Lat: 21.424357 Long: -157.754252

  • Multi Maps from ACME
  • Maps from Bing
  • Maps from Google
  • Elevation: .....'


  • Bennett, John D., Oahu's Solitary 8-inch 1940-Project Battery Construction No. 405 (Battery Robert E. DeMerritt), Coast Defense Journal, Volume 24, Issue 1, pages 33-60
  • Grobmeier, Alvin H., Officers of the U.S. Army and Others in Honor of whom Coast Artillery Forts and Batteries in Hawaii Have Been Named, CDSG News, Vol. 6, No. 4 (Nov. 1992), pp. 66-67
  • TM 4-210


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