Historic California Posts, Camps, Stations and Airfields
Fort Winfield Scott: Anti-Aircraft Battery
(Anti-Aircraft Battery No. 3)
Fort Winfield Scott Anti-Aircraft Battery
by Justin M. Ruhge
After World War I it became clear to the Army that coast defense batteries needed to be defended against air attack. The initial site selected by the Army at Fort Winfield Scott in 1920 was on the left flank of Battery Godfrey where two 3-inch guns were placed on two concrete plugs. This and two other antiaircraft batteries became the first such in the harbor defenses of San Francisco.
These guns were moved to Fort Funston in 1925. By 1937 two similar weapons were mounted on the same plugs as well as a third position added to the battery and was renamed AA Battery No. 3. These three weapons were moved to Fort Cronkhite in 1939. The original plugs remain today.
In addition, several camouflaged 30-caliber machine gun stations were located around the heavy gun emplacements during World War II.
Report of Completed Works - Seacoast Fortifications
Report of Completed Works - Seacoast Fortifications: Fort Winfield Scott Anti-Aircraft Battery
Additional World War II Air Defenses
M1 40mm Antiaircraft Gun on a M2A1 Carriage. (Public Domain)

Throughout World War II, the specter of a Japanese air attack, no matter how remote, hung over the commanders responsible for the defense of San Francisco. Even after the Battle of Midway, which destroyed much of its air arm, the Imperial Japanese Navy maintained the capability of striking the United States throughout the war. This included the capability of launching up to three float planes from the I-400 class of submarines.

With this in mind, dozens of mobile antiaircraft guns were placed throughout the bay area. Fort Funston's defenses were bolstered with the addition of five 40mm M1 "Bofors" antiaircraft guns mounted of the M2A1 carriage (figure 3-9). These sites were administratively assigned the following numbers according to the 1948 map of Fort Funston:

Additionally, there were five .50 caliber machine positions that provided close in defense. Additionally there was one Anti-Aircraft Seachlight position (No. 110). All of these guns were removed at the end of World War II.
Additional Online and Printed Histories
Harbor Defenses of San Francisco - A Field Guide 1890 to 1950
Anti-Aircraft Weapons of the Coast Artillery
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Updated 8 February 2016