Battery AMTB 922

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Battery AMTB 922 (1943-194?) - Battery AMTB 922 was a reinforced concrete World War II AMTB rapid fire 90mm gun battery on Fort Getty, Newport County, Rhode Island. Battery construction started 25 Jun 1943, was completed 6 Aug 1943 and transferred to the Coast Artillery for use 23 Dec 1943 at a cost of $ 4,651. Deactivated in 194?.

Battery AMTB 922 Gun Emplacement
Battery AMTB 922 Gun Emplacement in Front of Battery Tousard
Battery AMTB 922 Field of Fire

Battery AMTB 922 History

Part of the Harbor Defense of Narragansett Bay.
The AMTB battery at Beaver Head consisted of two 90mm guns mounted on 90mm M3 fixed gun mounts and two 90mm guns mounted on 90mm M1A1 mobile gun mounts. 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. Each weapon required a crew of 15, 9 men in the gun squad and 6 men in the ammunition squad. Electrical power furnished by M7 portable generators in revetments.


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."

References:

  • 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 922 Armament (edit list)
Empl
No
Caliber
Type
Barrel
Length
Model Serial
No
Manufacturer Carriage Service
Dates
Notes
1 90mm Rifle 186.15" M1 10776 Watervliet Pedestal Mount, M3, #207, GM 1943-194?
2 90mm Rifle 186.15" M1 15611 GM Pedestal Mount, M3, #206, GM 1943-194?
3 90mm Rifle 186.15" M1 ? Unknown Mobile Mount,M1A1, #?, Unknown 1943-194?
4 90mm Rifle 186.15" M1 ? Unknown Mobile Mount,M1A1, #?, Unknown 1943-194?
Source: RCW Form 1, Aug 1944, Coast Defense Study Group, 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, 205
Battery AMTB 922 Plan


Current Status

Part of Fort Getty City Park, Jamestown, Conanicut Island, Newport County, Rhode Island. No period gun or mounts in place.


Location: Fort Getty City Park, Jamestown, Conanicut Island, Newport County, Rhode Island.

Maps & Images

Lat: 41.48979 Long: -71.399613

Sources:

  • U.S.Army, Supplement to the Harbor Defense Project of Narragansett Bay, (HDNARB-AP-45), 1 Feb 1945, CDSG

Links: CDSG

Visited: 29 May 2012



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