The return to sea brought TF 38 into active participation in support of the Luzon invasion at Lingayen. The fast carriers sought to keep Japanese reinforcements—airborne, naval, and land—from entering the fray against the invading forces by keeping enemy air-power grounded and by sinking as much of his shipping as possible. Thus, "Wedderburn" resumed her role as guardian of the carriers while their planes made up the offensive arm of the Third Fleet. On 3 and 4 January 1945, fast carrier aircraft hit air installations and shipping at Formosa and Okinawa. They went after targets on Luzon itself on the 6th and 7th and, on the 9th, the day of the initial landings, returned to Formosa for air suppression duty while troops were going ashore. Following that assignment, she moved through Bashi Channel with TF 38 for two weeks of air raids on Japanese-held southern China and French Indochina which included an anti-shipping sweep of the South China Sea. On the return voyage, TF 38 planes struck at the Nansei Shoto, a group of islands near Okinawa, on the 21st and 22d before reentering Ulithi Lagoon on the 25th.