A more significant Japanese counterattack came in the form of the 1st Mobile Fleet, the main carrier strike force. In the ensuing Battle of the Philippine Sea from 19 to 20 June, "Indiana" provided anti-aircraft support to the American carrier fleet. She and "South Dakota" reported the initial wave of Japanese aircraft early on 19 June, and at 10:48 her anti-aircraft gunners opened fire, quickly shooting down one Japanese aircraft. The ship was forced to take evasive maneuvers at around 11:50, when a torpedo bomber attacked her; the torpedo exploded harmlessly in the ship's wake. As a Japanese fighter approached to strafe "Indiana", her guns shot away the plane's tail at 12:13, sending it crashing into the sea. The ship's luck ran out shortly thereafter, as a burning Nakajima B5N2 torpedo bomber crashed into her starboard side, hurling burning debris over the deck. The ship was not damaged in the crash and "Indiana" remained on station. In the course of the battle, she had fired 416 shells from her secondary guns, 4,832 rounds of 40 mm ammunition and around 9,000 rounds from her 20 mm guns; she suffered five casualties, all men injured by shell fragments from other ships' anti-aircraft guns.