6 Mar, 1944
USS Flounder (Cdr. C.A. Johnson) arrives at Milne Bay, New Guinea from New London.

17 Mar, 1944
USS Flounder (Cdr. C.A. Johnson) departs Milne Bay for her 1st war patrol. She was ordered to patrol off the Palau's.

9 May, 1944
USS Flounder (Cdr. C.A. Johnson) ends her 1st war patrol at Milne Bay.

3 Jun, 1944
USS Flounder (Lt.Cdr. J.E. Stevens) departs Manus for her 2nd war patrol. She is ordered to patrol in the Philippine Sea.

17 Jun, 1944
USS Flounder (Lt.Cdr. J.E. Stevens) torpedoes and sinks the Japanese torpedo recovery vessel Nihonkai Maru (2684 GRT) south of Mindanao, Philippines in position 06º36'N, 127º55'E. (see map)

12 Jul, 1944
USS Flounder (Lt.Cdr. J.E. Stevens) ends her 2nd war patrol at Brisbane, Australia.

1 Aug, 1944
USS Flounder (Lt.Cdr. J.E. Stevens) departs Brisbane for her 3rd war patrol. She is ordered to patrol in the Philippines.

8 Aug, 1944
USS Flounder (Lt.Cdr. J.E. Stevens) toppes off with fuel at Manus. She departs that base the next day.

28 Aug, 1944
USS Flounder (Lt.Cdr. J.E. Stevens) calles at Mios Woendi to take on additional fuel and provisions. She resumes her 3rd war patrol on 1 September.

4 Oct, 1944
USS Flounder (Lt.Cdr. J.E. Stevens) ends her 3rd war patrol at Brisbane.

27 Oct, 1944
USS Flounder (Cdr. J.E. Stevens) departs Brisbane for her 4th war patrol. She is ordered to patrol in the South China Sea.

9 Nov, 1944
The German submarine U-537 was sunk in the Java Sea east of Surabaya, in position 07º13'S, 115º17'E, by torpedoes from the US submarine USS Flounder (Cdr. J.E. Stevens). (see map)

21 Nov, 1944
USS Flounder (Cdr. J.E. Stevens) torpedoes and damages the Japanese army cargo ship Gyosan Maru (5698 GRT) in the South China Sea in position 10º36'N, 115º08'E. The damaged Japanese ship is later finished off by USS Guavina. (see map)

13 Dec, 1944
USS Flounder (Cdr. J.E. Stevens) ends her 4th war patrol at Fremantle, Australia.

7 Jan, 1945
USS Flounder (Cdr. J.E. Stevens) departs Fremantle for her 5th war patrol. She was ordered to patrol in the South China Sea.

12 Jan, 1945
USS Flounder (Cdr. J.E. Stevens) returns to Fremantle to make repairs to her defective fathometer.

14 Jan, 1945
With the repairs to her fathometer completed USS Flounder (Cdr. J.E. Stevens) again sailes from Fremantle for her 5th war patrol.

22 Feb, 1945
During an attack on a Japanese ship USS Flounder (Cdr. J.E. Stevens) is nearly hit by one of her own torpedoes that ran erratically.

23 Feb, 1945
USS Flounder (Cdr. J.E. Stevens) collides with her sister ship USS Hoe 66 feet beneath the surface. Fortunately neither submarine was seriously damaged.

26 Feb, 1945
USS Flounder (Cdr. J.E. Stevens) ends her 5th war patrol at Subic Bay, Philippines.

16 Mar, 1945
USS Flounder (Cdr. J.E. Stevens) departs Subic Bay for her 6th war patrol. She is ordered to patrol south of Hainan.

22 Apr, 1945
USS Flounder (Cdr. J.E. Stevens) ends her 6th war patrol at Saipan. She was now ordered to the Mare Island Navy Yard for a major overhaul.