At the time of the attack on Pearl Harbor, Mikuma was assigned to cover the invasion of Malaya as part of Cruiser Division 7 under Vice Admiral Jisaburo Ozawa's First Southern Expeditionary Fleet, providing close support for landings of Japanese troops at Singora, Pattani and Kota Bharu.
The Sultanate of Singora was a port city located on and around the foothills of Khao Daeng mountain, now in Singha Nakhon, Songkhla Province, Thailand.
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In 1679, Siamese King Narai's armada began a final offensive to quash the Singora rebellion.