Battery 155 - Hill 400

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Battery 155 - Hill 400 (1943-1944) - Battery 155 - Hill 400 was a temporary, World War II, 155mm coastal gun battery on Panama mounts. Located on Fort Mears, Aleutians West Census Area, Alaska. Battery construction started in October 1942, was completed in December 1943 and transferred to the Coast Artillery for use on 21 Dec 1943. Deactivated in 1944.

155mm GPF Gun & Partial Crew at Nearby Fort Schwatka.

World War II

Part of the Harbor Defense of Dutch Harbor.

Map Extract of Location 7 on Hill 400 Showing Gun Emplacements and BC Station Locations. Click to expand.
List of Housing on Hill 400 circa 1944.

Originally built as a temporary World War II coastal gun battery with four 155mm 1918 rapid fire guns mounted on 1918 mobile carriages emplaced on concrete circular (360 degrees) Panama mounts. The guns were initially emplaced in tactical positions until the concrete Panama mounts were completed and accepted for service in 1943. The Battery was constructed on Hill 400 at the southern end of Amaknak Island on the Fort Mears reservation. The position was also known as Bunker Hill or Little South America locally.

The battery was carried on the Harbor Defense Plan Annex as Battery Tactical 2 - 155mm at Location 7, on Hill 400. The 61-acre site was procured on 14 Jun 1942 for the 155mm Battery and associated Garrison. The Battery included a buried concrete Plotting Room, 10' by 40', a Battery Commanders (BC) station, two Base End Stations (BES) and a number of magazines. The Battery was not formally named.

The maximum elevation range for the battery at this location was 19,100 yards or 10.85 miles, with the 360-degree coverage, this battery could cover almost all of Unalaska Bay out to the mouth where other batteries were positioned to cover the approaches.

Ammunition authorized for the Battery included a battle allowance of 3200 complete rounds and a War Reserve of 3200 complete rounds.

By August 1944 the guns and ordinance were reported in storage at Fort Mears and all 155mm ammunition was ordered shipped away from Harbor Defense but the Battery was also listed to be retained for the "Duration of Emergency".

155mm M1918 Gun at Fort Morgan
Panama Mount at Fort Pickens

Current Status

No period guns or carriages in place. Some remains of the structures.

Location: Fort Mears, Aleutians West Census Area, Alaska

Maps & Images

Lat: 53.87510 Long: -166.55657

  • Multi Maps from ACME
  • Maps from Bing
  • Maps from Google
  • Elevation: 400' ~

GPS Locations:

See Also:


  • U.S.Army, Supplement to the Harbor Defense Project Harbor Defenses of Dutch Harbor, (SRHDDH), 1944, CDSG
  • Denfield, Colt, Dutch Harbor Coastal Defenses, Coast Defense Study Group Journal, Volume 7, Number 1, February, 1993, page 30-36.
  • Willford, Glen M., Visitation to Alaskan WWII Coast Defense Sites, August 1997, The CDSG Newsletter, The Coast Defense Study Group, Inc., November 1997, page 2-3.

NPS - Fort Schwatka Self Guided Tour (large pdf)


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