Battery AMTB 6 - West Martello Tower

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Battery AMTB 6 - West Martello Tower (1943-1946) - Battery AMTB 6 West Martello Tower was a reinforced concrete World War II rapid fire 90mm gun battery on Fort Fort Taylor (2), Florida. AMTB stands for Anti Motor Torpedo Boat. Battery construction started and was completed in 1943. Deactivated in 1946.

Battery AMTB 6 West Martello Tower Site View
Battery AMTB 6 West Martello Tower Gun Pad Disguised as a Gazebo


Part of the Harbor Defense of Key West.
The AMTB battery at the West Martello Tower consisted of two 90mm guns mounted on 90mm M3 gun mounts and two 90mm guns mounted on mobile carriages. The two mobile 90mm guns and carriages were stored inside the Martello Tower. Concrete pads for both the fixed guns were laid at the beach just west of the West Martello Tower. 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."


  • 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 6 West Martello Tower Armament (edit list)
Model Serial
Manufacturer Carriage Service
1 90mm Rifle 186.15" M1 A1 5571 Watervliet Pedestal Mount, M3, #215, General Motors 1943-1946
2 90mm Rifle 186.15" M1 A1 7153 General Motors Pedestal Mount, M3, #231, General Motors 1943-1946
3 90mm Rifle 186.15" M1 2906 Watervliet Pedestal Mount, M1, #1122, York 1943-1946
4 90mm Rifle 186.15" M1 3542 Watervliet Pedestal Mount, M1, #3833, Worthington 1943-1946
1. 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
2. NARA RG165, E257 Box 68 - Bolling Smith
Battery AMTB 6 West Martello Tower Location

Current Status

Both gun pads are still visible but have been repurposed as gazebos. No period gun or mounts in place.

Location: Fort Taylor, Key West, Monroe County, Florida

Maps & Images

Lat: 24.5470939 Long: -81.7876822

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


Links: CDSG

Visited: 27 Dec 2009

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