text:  The <unk> then decided to use the sisters and their escorts to bring a load of petrol , rubber , tin and other strategic minerals back to Japan after the American carriers departed the South China Sea ( Operation <unk> ) . They loaded their cargoes beginning on 6 February at Singapore and departed four days later . Also carrying some 1 @,@ 150 <unk> workers , they were escorted by <unk> and three destroyers . <unk> Japanese radio signals revealed the Japanese plan to the Allies , and 15 submarines were positioned along their anticipated route in an attempt to intercept and sink the ships . An additional 11 were moved into position while the group was en route , but only three were ultimately able to attack . None of them were successful before the Japanese reached <unk> on 20 February . The Fourth Carrier Division was disbanded on 1 March and the sisters were reduced to 1st rank reserve ships . On 19 March <unk> was attacked by aircraft from Task Force 58 and <unk> was hit three times by bombs that killed 37 men and wounded 52 . Her gunners claimed to have shot down one American dive bomber during the attack . <unk> was hit twice during the attack , but her casualties , if any , are unknown . 
  