Battery AMTB 941

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Battery AMTB 941 (1943-1946) - Battery AMTB 941 was a reinforced concrete World War II AMTB rapid fire 90mm gun battery on Fort Revere, Plymouth County, Massachusetts. Battery construction started 18 May 1943, was completed 17 Jun 1943 and transferred to the Coast Artillery for use 10 Sep 1943 at a cost of $ 6,856.00. Deactivated in 1946.

World War II

Part of the Harbor Defense of Boston, Massachusetts.
The AMTB battery at Fort Revere 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)

Battery AMTB 941 Armament (edit list)
Model Serial
Manufacturer Carriage Service
F1 90mm Rifle 186.15" M1 6839 Chevrolet Pedestal Mount, M3, #133, Fisher 1943-1946
F2 90mm Rifle 186.15" M1 5348 Chevrolet Pedestal Mount, M3, #143, Fisher 1943-1946
M1 90mm Rifle 186.15" M1 3457 Watervliet Mobile Mount,
M1A1, #3800, Watertown
M2 90mm Rifle 186.15" M1 3458 Watervliet Mobile Mount,
M1A1, #37, Watertown
Source: RCW Form 1, 1 Mar 1944, CDSG, Berhow, Mark A. ed, American Seacoast Defenses: A Reference Guide, 2nd Edition, CDSG Press, McLean, VA, 2004, ISBN 0-9748167-0-1, pages 80-81
Battery AMTB 941 Plan

Current Status

On private property, Hull, Plymouth County, Massachusetts. No period gun or mounts in place.

Location: Private Property, Hull, Plymouth County, Massachusetts. Map point approximate.

Maps & Images

Lat: 42.307372 Long: -70.906041

  • Multi Maps from ACME
  • Maps from Bing
  • Maps from Google
  • Elevation: Gun #1= 73.43', Gun #2= 73.41'

See Also:


  • U.S. Army Corps of Engineers, FUDS Archives Search Report, Findings, Fort Revere, Project No. D02MA021502, September 1995. Large PDF Download
  • U.S.Army, Supplement to the Harbor Defense Project of Boston, Massachusetts, (HDB-AN-45), 31 Jan 1945, CDSG


Visited: 9 May 2018

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