 Complete the following phrase:  On the Kidō Butais return journey from Pearl Harbor, IJN carriers Soryu and Hiryu and their supporting screen split off from the main group and went to Wake Island to support Japans invasion there. From there, they went to Ambon Island in the Dutch East Indies and bombed it as part of a Japanese operation to isolate resource-rich Java. The other four fleet carriers returned to Japans Inland Sea. From there, they sortied south to support the invasion of New Britain, enabling the establishment of a powerful Japanese naval base at Raboul. Soryu and Hiryu, along with light carriers Zuiho and Ryujo, supported the invasion of raw material-rich Java. The USS Langley, Americas first aircraft carrier but then serving as a seaplane tender, was delivering planes to Java during this period. In February, it was sunk by Japanese bombers with 32 badly needed Allied planes aboard. 