Battery AMTB - Marrowstone Point

Battery AMTB - Marrowstone Point (1944-1946) - Battery AMTB - Marrowstone Point was a reinforced concrete World War II rapid fire 90mm gun battery on Fort Flagler, Washington. AMTB stands for Anti Motor Torpedo Boat. Battery construction started 8 Oct 1943, was completed 20 Dec 1943 and transferred to the Coastal Artillery for use 25 Mar 1944. Deactivated in 1946.

File:Fort Flagler AMTB - Marrowstone Point.jpg

Battery AMTB - Marrowstone Point History

Part of the Harbor Defense of Puget Sound.
The AMTB battery at Marrowstone Point consisted of two 90mm gun mounted on 90mm M3 gun mounts and two 90mm mobile guns. 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 - Marrowstone Point Armament (edit list)

Empl No	Caliber Type	Barrel Length	Model		Serial No	Manufacturer	Carriage	Service Dates	Notes
1	90mm Rifle	186.15"	M1		6682	General Motors	Pedestal Mount, M3, #81, Fisher	1944-1946
2	90mm Rifle	186.15"	M1		5389	Watervliet	Pedestal Mount, M3, #166, Fisher	1944-1946
Source: RCW Form 1, 25 Mar 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

Battery AMTB - Marrowstone Point Plan

Current Status

No period gun or mounts in place and the gun pads are in the surf.

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Location: (Map point is approximate) Marrowstone Point, Fort Flagler, Washington Maps & Images Lat: 48.1012984 Long: -122.6873034 Multi Maps from ACME Maps from Bing Maps from Google Elevation: 13.8'

Sources:

• Coast Defense Study Group, Press, Digital Library, Forums

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