On 7 December 1941, "San Francisco" was in Pearl Harbor awaiting docking and the cleaning of her heavily fouled bottom. Her engineering plant was largely broken down for overhaul. Ammunition for her 5 in (127mm) and 8 in (203mm) guns had been placed in storage. Her guns had been removed to permit installation of four quadruple mounts, although the mounts had not yet been installed. Her machine guns were being overhauled. Only small arms and two machine guns were available. Moreover, a number of "San Francisco's" officers and men were absent.