"Zuikaku"s aircraft also attacked the Australian bases at Rabaul on 20 January 1942 and Lae in New Guinea on 21 January. In April 1942, she took part in the Indian Ocean raid, striking the British naval bases at Colombo and Trincomalee on Ceylon, and sinking the Royal Navy aircraft carrier and the heavy cruisers and , also with the help of "Shōkaku".