Operation "Forager"
Indianapolis, escorted by two destroyers, left Pearl Harbor on 26 May for Majuro, Kwajalein and Eniwetok. On 9 June, she joined Task Force 58. Their targets were Guam, Saipan and Tinian. Capture of these islands would bring Japan within the range of the new Boeing B-29 Superfortress bombers.
Indianapolis joined the pre-invasion bombardment group off Sipan on 13 June -- D-Day minus two. On June 14, Indianapolis was hit by one shell from a Saipan battery. She shell was defective, and didn't explode -- damage was minimal.
During June, the 5th Fleet was busy with the Marianas assault, raids on Saipan which began with carrier-based planes on the 11th followed by surface bombardment, in which Indianapolis had a major role, from 13 June. On D-Day, 15 June, Admiral Spruance received reports that a large fleet of battleships, carriers, cruisers and destroyers was headed south to relieve their threatened garrisons in the Marianas. Since amphibious operations at Saipan had to be protected at all costs, Admiral Spruance could not draw his powerful surface units too far from the scene. Consequently, a fast carrier force was sent to meet this threat while another force attacked Japanese air bases on Iwo Jima and Chichi Jima in the Bonin and Volcano Islands bases for dangerous potential enemy air attacks.

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