Battery AMTB 2A - Sullivans Island

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Battery AMTB 2A - Sullivans Island (1943-1946) - Battery AMTB 2A - Sullivans Island was a reinforced concrete World War II rapid fire 90mm gun battery built on old Battery Jasper, Fort Moultrie, South Carolina. AMTB stands for Anti Motor Torpedo Boat. Battery construction started 12 Feb 1943, was completed 28 Mar 1943 and transferred to the Coast Artillery for use 2 Jul 1943. Deactivated in 1946.

Battery Jasper Gun Emplacement #1 Under Repair
Battery Jasper B.C. Post
Battery Jasper

Battery AMTB 2A - Sullivans Island History

Part of the Harbor Defense of Charleston.
The AMTB battery at Sullivans Island consisted of two 90mm gun mounted on 90mm M3 fixed gun mounts and two mobile 90mm guns on M1A1 mobile carriages. Concrete pads for these guns were laid on top of the four gun emplacements of old Battery Jasper. 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.


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 2A - Sullivans Island Armament (edit list)
Empl
No
Caliber
Type
Barrel
Length
Model Serial
No
Manufacturer Carriage Service
Dates
Notes
1 90mm Rifle 186.15" M1 ? General Motors Mobile #?, General Motors 1943-1946
2 90mm Rifle 186.15" M1 6953 General Motors Pedestal Mount, M3, #131, General Motors 1943-1946
3 90mm Rifle 186.15" M1 6832 General Motors Pedestal Mount, M3, #50, General Motors 1943-1946
4 90mm Rifle 186.15" M1 ? General Motors Mobile #?, General Motors 1943-1946
Source: RCW Form 1, 15 Jun 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, 210
Battery AMTB 2A - Sullivans Island Plan


Current Status

No period gun or mounts in place.


Location: Battery Jasper, Fort Moultrie, Charleston County, South Carolina

Maps & Images

Lat: 32.7583169 Long: -79.8551935

Sources:

Links:

Visited: 23 Jan 2010

Battery AMTB 2A - Sullivans Island Picture Gallery

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