Deployment To Australia, 1943
Changing her base of operations to Australia, Grayling stood out of Fremantle on 7 January 1943 on her fifth patrol, this time in Philippine waters. She sank cargo ship Ushio Maru west of Luzon on 26 January and damaged another Japanese ship the next day. After sinking a schooner on 24 February, Grayling returned to Fremantle.
Grayling left Australian waters on 18 March on her sixth war patrol and cruised in the Tarakan area and the Verde Island Passage. There, she attacked and sank cargo ship Shanghai Maru on 9 April and damaged four other ships before returning to Fremantle on 25 April.
Her seventh war patrol, commencing 18 May, took Grayling into the waters off northwest Borneo, where she damaged a freighter and two smaller ships before returning to her base 6 July.
Read more about this topic: USS Grayling (SS-209)