Battery AMTB - Marrowstone Point
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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, Jefferson County, Washington. 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.
World War II (1941-1945)
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 guns on M1A1 mobile carriages. 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.
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."
|1||90mm Rifle||186.15"||M1||6682||Chevrolet||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, Coastal 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|
A part of Fort Flagler State Park, Jefferson County, Washington. No guns or mounts in place.
Location: (Map point is approximate) Marrowstone Point, Fort Flagler State Park, Jefferson County, Washington.
Maps & Images Lat: 48.1012984 Long: -122.6873034
- U.S.Army, Supplement to the Harbor Defense Project, Harbor Defenses of Puget Sound, (CCA-AN-PS), 12 Aug 1945, CDSG
Visited: 17 April 2010
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