Battery AMTB - Galveston Seawall

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Battery AMTB - Galveston Seawall (1943-1946) - Battery AMTB - Galveston Seawall was a reinforced concrete, World War II 90mm coastal gun battery on Fort San Jacinto, Galveston County, Texas. Battery construction started 2 Dec 1942, was completed 2 Apr 1943 and transferred to the Coast Artillery for use 4 Aug 1943 at a cost of $ 17,039.16. Deactivated in 1946.

Battery AMTB - Galveston Seawall Gun #4 Base
Battery AMTB - Galveston Seawall Location Sign

World War II (1941-1945)

Part of the Harbor Defense of Galveston.

Originally built as a World War II coastal gun battery with four 90mm M1 guns, two mounted on T-3 fixed carriages and two mounted on mobile M1A1 carriages.

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 - Galveston Seawall Armament (edit list)
Model Serial
Manufacturer Carriage Service
1 90mm Rifle 186.5" M1 3537 Watervliet AA, M1A1, #3832, Worthington 1943-1946
2 90mm Rifle 186.5" M1 7177 General Motors Pedestal., T-3, #179, Fischer Body 1943-1946
3 90mm Rifle 186.5" M1 3536 Watervliet AA, M1A1, #1572, Watertown 1943-1946
4 90mm Rifle 186.5" M1 6921 General Motors Pedestal, T-3, #106, Fischer Body 1943-1946
Source: RCW Form 1, 1 Jun 1945, 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 .....
Battery AMTB - Galveston Seawall Plan

Current Status

No period guns or mounts in place.

Location: Fort San Jacinto, Galveston County, Texas

Maps & Images

Lat: 29.335191 Long: -94.752426

  • Multi Maps from ACME
  • Maps from Bing
  • Maps from Google
  • Elevation: 24.5'


  • U.S.Army, Supplement to the Harbor Defense Project of Galveston, (HD-G-ANN-45), 15 Mar 1944, CDSG


Visited: 12 Nov 2009

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