Sweeping on the night shift

The date: the overnight of 22/23 July 1945. U.S. Navy Destroyer Squadron 61 (DesRon 61, CAPT Thomas Henry Hederman), consisting of nine modern Allen M. Sumner-class destroyers USS De Haven (DD-727), Mansfield (DD-728), Lyman K. Swenson (DD-729), Maddox (DD-731), Collett (DD-730), Taussig (DD-746), Blue (DD-744), Samuel N. Moore (DD-747), and Brush (DD-745), sweeps Sagami Bay– lower Tokyo Bay.

With each of the Sumners mounting six 5″/38s, they could get off a tremendous amount of fire when needed.

Detecting a Japanese convoy of four vessels at 2305 while still 33,000 yards away, the chase was on. Closing to within 11,000 yards by 2353, the engagement took just 16 minutes and saw the DDs fire 3,291 5-inch shells and let fly some 18 torpedoes. 

The score? One Japanese merchant ship was sunk– the freighter No.5 Hakutetsu Maru (810 t), and the other, Enbun Maru (7,030 t), damaged. The escorting IJN minesweeper (No. 1) and subchaser (No. 42) were unharmed. The little convoy was carrying a disassembled aircraft factory and was headed to Korea to set up shop, a trip that was aborted after the battle. 

The American losses were zero.

As noted by the National WWII Museum, the engagement, termed today the Battle of Sagami Bay, was “the first time U.S. Navy ships entered the outer reaches of Tokyo Bay since April 1939.”

While DesRon 61 never received a commendation for the action, Halsey himself signaled afterward, pointing out that the force rode heavy post-typhoon seas into the Bay with great effect:

“Commander Third Fleet notes with great satisfaction the success of this well-planned and executed attack.

Commander Destroyer Squadron 61 is to be congratulated on the sound judgment, initiative and aggressive spirit displayed in ‘beating the weather’ to drive this attack home at the very door of the Empire.

You are unpopular with the Emperor. Well done”.

Allied ships entered Japanese waters 27 August 1945 on the eve of the surrender, and staged in Sagami Bay, where DesRon 61 had its shootout the month prior. 

Surrender of Japan, 1945. Description: U.S. and British warships anchored in Sagami Wan, outside of Tokyo Bay, Japan, on the day the Allied ships entered Japanese waters, 27 August 1945. Photographed from USS South Dakota (BB-57) as the sun set behind Mount Fuji’s distinctive cone. Official U.S. Navy Photograph, now in the collections of the National Archives. Catalog #: 80-G-490487

Epilogue

Hederman, an Annapolis grad (USNA ’23) had already earned a Navy Cross with DesRon61 off Okinawa and would retire in the 1950s as a rear admiral.

The nine tin cans would continue in U.S. service through Korea and Vietnam then were disposed of, with several going to overseas allies to live a second life. This included De Haven transferred to South Korea, Mansfield and Collett to Argentina— where they were assigned escort duty for the Argentine carrier Veinticinco de Mayo during the initial invasion of Port Stanley in the Falklands on 2 April 1982. Soon after, the two destroyers picked up the last screening duty for the pride of the fleet, the Brooklyn-class light cruiser ARA General Belgrano (ex-USS Phoenix). Meanwhile, Maddox (of later Tonkin Gulf fame), Moore, Taussig, Brush, and Swenson were sent to Taiwan where they survived for another three decades.

Blue, decommissioned in 1971, was disposed of in a SINKEX in April 1977.

2 comments

  • Not exactly “sweeping” using SG-3 Radar, which had an instrumental range of ~34.5-nmi., but a useful detection range of ~10.8-nmi. and could be off by as much as 400-yards even if it detected something. Nine destroyers firing ~3,291 Mk.12 5″ naval guns and sinking only one ship, means they were solely relying on Radar to hit anything…

  • So what word would you use in the title in lieu of sweeping?

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