Her sister ships, the "Indomitable" and the arrived at the end of June although only the latter's pilots were combat-ready. Captain Charles Lambe was appointed as the new captain of the "Illustrious" on 21 May, but he could not join his new ship until 9 July. Somerville decided to attack Sabang again (Operation Crimson), although the ships of the East Indies Fleet would bombard the port while the fighters from the "Illustrious" and the "Victorious" spotted for them and protected the fleet. As the Barracudas were needed only for anti-submarine patrols, the former embarked only nine while the latter ship flew off all her Barracudas. On the early morning of 25 July, "Illustrious" launched 22 Corsairs for CAP and to observe the naval gunfire and take photos for post-attack damage assessments. The bombardment was very effective, sinking two small freighters, and severely damaging the oil storage and port facilities. One Corsair was shot down by Japanese flak although the pilot was rescued after ditching. As the fleet was withdrawing, "Illustrious"s CAP intercepted and shot down a Nakajima Ki-43 (codenamed "Oscar") fighter and a Mitsubishi Ki-21 "Sally" medium bomber on reconnaissance missions. Later in the day her Corsairs intercepted 10 Ki-43s and shot down two of them while driving off the remainder. After arriving in Trincomalee, 1837 Squadron was transferred to the "Victorious".