Battery AMTB 5A - Fort Miles

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Battery AMTB 5A - Fort Miles (1943-1946) - Battery AMTB 5A - Fort Miles was a reinforced concrete World War II AMTB rapid fire 90mm gun battery on Fort Miles, Sussex County, Delaware. Battery construction started 1 Jan 1943, was completed 15 Jun 1943 and transferred to the Coast Artillery for use 21 Dec 1943 at a cost of $11,000.00. Deactivated in 1946.


Part of the Harbor Defense of the Delaware.
The AMTB 5A battery at Fort Miles consisted of two M1 90mm guns mounted on 90mm M3 fixed gun mounts and two M1 90mm guns mounted on 90mm M1A1 mobile gun mounts. Concrete pads for both of the fixed guns and timber platforms for the two mobile guns were laid at the point of Cape Henlopen. 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 5A - Fort Miles Armament (edit list)
Model Serial
Manufacturer Carriage Service
1 90mm Rifle 186.15" M1 534 Wheland Pedestal Mount, M3, #5986, Wheland 1943-1946
2 90mm Rifle 186.15" M1 7188 Chevrolet Pedestal Mount, M3, #254, Chevrolet 1943-1946
3 90mm Rifle 186.15" M1 547 Wheland Pedestal Mount, M3, #5999, Wheland 1943-1946
4 90mm Rifle 186.15" M1 5182 Chevrolet Pedestal Mount, M3, #96, Chevrolet 1943-1946
Source: RCW Form 1, 1 May 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, 208
Battery AMTB 5A - Fort Miles Plan

Current Status

Some Remains visible. No period gun or mounts in place.

Location: Fort Miles, Sussex County, Delaware

Maps & Images

Lat: 38.7948847 Long: -75.0915956

  • Multi Maps from ACME
  • Maps from Bing
  • Maps from Google
  • Elevation: 22.5'


  • U.S.Army, Supplement to the Harbor Defense Project of The Delaware, (HDDEL-AN-45), 1 Jul 1945, CDSG


Visited: 3 Aug 2010

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