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As a gunboat, Williamsburg was armed with two 3-inch gun mounts, six .50 caliber machine guns, two .30 caliber Lewis machine guns, two dct, one "Y" gun, 16 rifles, and 10 pistols. Her crew complement was 81.
After final alterations, the gunboat departed Norfolk on 2 December, touched briefly at Washington, D.C., and eventually arrived at Halifax, Nova Scotia, on 6 December, the day before the Japanese attacked Pearl Harbor.
http://www.yachtworld.com/boats/1930/USS-WILLIAMSBURG-Custom-1603111/Rapallo/Italy#.UZz_n8qv-kf