Battery AMTB 952

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Battery AMTB 952 (1943-1946) - Battery AMTB 952 was a reinforced concrete World War II AMTB rapid fire 90mm gun battery on Fort Foster (1), Gerrish Island, York County, Maine. Battery construction started in 1943, was completed in 1943 and transferred to the Coast Artillery for use in 1943. Deactivated in 1946.

Fort Foster, Battery AMTB 952, one emplacement underneath pavilion

World War II

Part of the Harbor Defense of Portsmouth, New Hampshire.

The AMTB battery at Fort Foster consisted of two 90mm guns mounted on 90mm M3 fixed gun mounts and two 90mm guns mounted on 90mm M1A1 mobile gun mounts. Concrete pads were provided for both fixed guns and often wooden gun platforms were provided for the mobile guns. Two earth covered concrete magazines provided protection for the ammunition. Electric power was provided by M-7 portable generators.

The battery had a dual mission of defense against fast enemy motor torpedo boats and enemy aircraft. The effective range of the guns was about 8,000 yards or 4.5 miles. Each weapon required a crew of 15, 9 men in the gun squad and 6 men in the ammunition squad.

AMTB Front View
AMTB Interior View
AMTB Side View
AMTB Back View

The above photos were taken at Fort Monroe, Battery Parrott

From FM 4-91: "This weapon consists of the 90-mm gun M1 and top carriage M1A1 on the 90-mm gun mount M3. The mount M3 is of the turret type, the shielding being constructed of boiler plates. This boiler plate shield provide fragmentation protection only. No shielding is provided at the rear due to the requirements for service of the piece. A sighting port in the shielding in front permits sighting in direction by the gun pointer."


  • FM 4-91 - 90-MM Gun, Fixed Mount Service of the Piece
  • FM 4-126 - Antiaircraft Artillery, Service of the Piece, 90-mm Antiaircraft Gun
  • TM 9-373 - 90-mm Gun M1 and 90-mm Gun Mount T3 (M3)

Current Status

Part of Fort Foster City Park, Gerrish Island, York County, Maine. No period gun or mounts in place. One gun emplacement is located underneath the pavilion with a Battery 952 AMTB sign.

Location: Fort Foster City Park, Gerrish Island, York County, Maine

Maps & Images

Lat: 43.066889 Long: -70.691416


  • U.S.Army, Supplement to the Harbor Defense Project, Harbor Defenses of Portsmouth, New Hampshire, (CCA-P-PCC), 1945, CDSG


Visited: 20 Jun 2012

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