T Class Submarines and fourth of this Class
ordered from HM Dockyard, Chatham with HM
Submarine TRADEWIND on 25th August 1941 and
laid down on 9th
May 1942. This submarine was launched on 24th
March 1943 as P331 but was renamed TRENCHANT
later 1943 before build completion on 26th
February 1944 Work-up was carried out in the
Clyde after the ship had been commissioned for
service. This boat had a minelaying
a t t l e H o n o u r s
e r a l d i c D a t a
saltire Red and barry wavy of six White and
sword erect, Proper, pommel and hilt Gold.
u m m a r y o f W a
r S e r v i c e
9 4 4
Carried out contractor’s sea trials in Nore
Commissioned for service with 4th Submarine
Carried out Acceptance Trials
Commanding Officer Lieutenant Commander AR
On completion took passage to Clyde to work-up
for operational service with
7th Submarine Flotilla in Clyde area.
Deployed with Flotilla in Clyde area
Took passage to Ceylon to join Flotilla
On passage to join Flotilla
Commanding Officer promoted to Commander
Joined Flotilla at Trincomalee for interception
patrols and Fleet duties in Indian Ocean.
Deployed for patrol with Flotilla based at
Carried out unsuccessful attack on coaster in
Intercepted same vessel and a minelayer.
Sank both ships and captured 14 survivors.
Sailed for interception patrol in Malacca Strait
(Note: It was known that German U-Boats were
being used to carry cargo to and from
Penang and one of the priorities for submarines
deployed in this area was to intercept
Landed SOE party for covert operations in North
Sank two junks by surface gunfire.
Carried out attack on U589 off Penang and sank
submarine with a three torpedo salvo.
Rescued ten of the eighteen survivors. Remainder
were saves by a Japanese submarine.
Carried out minelay which later caused sinking
of two mercantiles totalling 2,814 tons.
Deployed for patrol in Malacca Strait. and to
carry out special operation at Phuket Island.
(Note: Submarine was carrying two CHARIOT manned
torpedoes with crews
Launched two CHARIOTS to attack mercantiles in
harbour at Phuket..
Mercantile SUMATRA MARU of 984 tons was sunk and
another VOLPI was damaged.
Patrol deployment in continuation
Deployed with HM Submarine TERRAPIN for joint
interception patrol in Malacca Strait
Two ships of 1,053 tons, three coasters, five
junks and two landing craft were sunk with
three other small craft damaged.
9 4 5
Malacca Strain interception patrol in
Carried out bombardment of Pulo Padang
Returned to Fremantle
Carried out interception deployment during which
five coasters, three barges and a junk
In a joint operation with HMS TERRAPIN sank
Japanese Submarine Chaser TOKUMI TEI
(Ch-8) by surface gun action.
Flotilla deployment in continuation
Passage to Fremantle
Sailed for first patrol from Fremantle.
Examined anchorages on south coast of Sumbawa
with finding any targets.
Attacked coaster west of Sourabaya but missed.
Engaged and sank auxiliary minesweeper Wa105 in
surface gun action.
Deployed HM Submarine STYGIAN to carry out joint
operation to intercept Japanese
cruiser ASHIGARA known to be on passage to
Carried out attack on Japanese cruiser ASHIGARA
and sank her in position 14 miles SW
of Muntok Is. in Banka Strait with five
(For details see THE FORGOTTEN FLEET by J
Winton. and WAR WITH JAPAN
Sank four small craft in Malacca Strait.
East Indies Fleet duties in continuation.
Commanding Officer, Lieut J C Ogle.
o s t W a r N o t e s
TRENCHANT sailed for return to UK after VJ Day
and arrived at Portsmouth in November 1945 to
Pay-off. After being reduced to Reserve status
she was laid-up in Gosport until
recommissioned in 1949 for service in the 3rd
Submarine Flotilla based at Rosyth.
Transferred to the Mediterranean in 1951 she
served with the 1st Flotilla based in Malta
until 1959 when she was again placed in
Reserve at Chat ham until placed on the
Disposal List in 1962. This submarine was sold
to BISCO the next year for demolition by Metal
Industries at Faslane in the Clyde where she
arrived in tow on 23rd July 1963.