The invasion began on 20 November. Radford's force was occupied with air strikes on Japanese ground targets, and faced frequent attack by Japanese aircraft in night combat, which U.S. aircrews were not well prepared or equipped for. He improvised a unit to counter Japanese night raids, and was later credited with establishing routines for nighttime combat air patrols to protect carriers; these were adopted fleetwide. He commanded Carrier Division Eleven around Tarawa for several more days, returning to Pearl Harbor on 4 December.