A ranar 28 ga watan Disamba, 1941, "Ro-34" ya tashi daga Cam Ranh Bay don fara aikinsa na farko na yaki, ya sanya wani yanki na aiki a Karimata Strait don tallafawa
Harin da Japan ta kai Malaya ta Burtaniya. Ta ba ta da wata matsala, kuma ta koma Cam Ranh Bay a ranar 11 ga Janairu, 1942.