Due to the losses his brigade suffered on 16 June, Porter decided to continue the bombardment before undertaking further attacks. On 18 and 19 June the bombardment of the Pocket was intensified when the heavy cruiser HMAS "Shropshire" fired into the area. Infantrymen supported by tanks conducted another probe into the Pocket on 19 June, and killed 10 Japanese; three Australians were wounded. On 20 June the 2/12th Field Regiment fired a particularly heavy bombardment and six Allied bombers attacked the Pocket. Porter judged that this would be sufficient to suppress the Japanese defenders, and ordered that the Pocket be attacked by two companies from the 2/28th Battalion supported by tanks (including "Frog" flamethrower variants of the Matilda II) the next day.