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Old 06-21-21, 05:31 PM   #5064
Bubblehead1980
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Default 7th(final war patrol) of USS Besugo SS-321 5 July-6 August-1945

TMO 2.5 w custom mods
100 realism
contacts off, cams on (for testing purposes)

USS Besugo SS-321
7th War Patrol
5 July-6 August 1945

Complement:72 Officers and men
Torpedoes:24 MK 16 x 6 MK 14x 6 MK 18 x 10 MK 27 x 2


Departed Subic Bay, Philippines at 0900 and set course for area D1- Gulf of Siam.


Arrived in patrol area on evening of 9 July. Intelligence reports indicate what little merchant shipping Japan has left transits the costal waters. Patrol routine was to skirt the shallow areas off shore in waters deep enough to submerge in case need to dive for aircraft or other reasons and at night to make high speed sweeps along the coast.

10 July- Patrolling a pocket of "deep"(150 feet ) water just 6 miles off Thai coast in western Gulf of Siam, SJ made a lone contact. Target was a 800 ton PC type.

0921-Fired a MK 27 homing torpedo from stern tube (#10). Torpedo failed to track properly and missed.


11 July- 0500 SJ made contact on three ships. Identified as small coastal cargo boats and a daihatsu landing barge,just 6000 yards off coast. Manned guns for battle surface. Approached convoy the rear just as dawn began to break, opening fire at 0621 from 1500 yards on the daihatsu, which quickly exploded under a barrage of gunfire.

The small coastal cargo boats armed with machine guns opened fire on Besugo scoring no hits. Besugo's 5 inch 40 and 20 MM guns quickly dispatched the two small boats, both of which exploded as were likely carrying ammunition and/or fuel.

1740- While transiting east across Gulf of Siam, encountered nine fishing type boats/sampans on course 090. Approached to investigate. These boats were armed with auto-cannons and machine guns and opened fire. With guns manned, Besugo swept from rear of convoy to attack. In a two hour gun action, sunk all nine vessels in vicinity of 8 04 N 102 48 E. Several MG/AC rounds scored hits on Besugo but no damage or casualties occurred.

14 July-

1012-Fired MK 18 torpedo at an Auxillary Subchaser, torpedo missed. While at 100(bottom is 110 feet) feet and moving away bombed by an aircraft. The SC arrived in area pining but did not locate Besugo thanks to heavy seas and thermocline.


16 July-

Sunk four junks by gunfire off Cau Mau Peninsula 9 07 N 104 10 E.


17 July-

1802- SJ contact on a convoy. Three ships with six escorts. Shadowed until nightfall then moved in for night surface attack in shallow waters off Indochina coast.


2247-The screen was effective in preventing Besugo from getting into usual range of 2500 yards for firing. Targeted large freighter and mid sized freighter. Fired three MK 16 at large freighter and one at mid sized freighter from 5100 yards AOB 65.

2150-Three torpedo impacts on large freighter. Large explosions.

2151-One torpedo impact in smaller freighter.

2156- Targets believed to be HAKUSIKA MARU 8378 tons and BIYO MARU 5498 tons both sunk. 9 42 N 103 41 E

2323-Reloading bow tubes completed. SJ revealed gap in screen as one stayed behind to search area. Will attempt exploit this for an attack on large remaining freighter.

2327-APR-1 detecting radar emissions from bearing of lead escort (Mikura Class Escort Vessel)

Throughout night attempted to work into position to attack the last ship but due to effective screening and shallow depths, unable to gain position. As had to depart shallow areas to reach deeper waters by dawn, broke off attack at 0400.

20 July-

0010-ULTRA received reporting a convoy would depart Bangkok for Cape St Jacques at 0600.


0700-Besugo into position along likely route of convoy off indochina coast to make contact around noon.

1400-Besugo made SJ contact. Convoy appears ot be four large shuips in middle with 9 escorts in encircling the body of convoy. Shadowed convoy until nightfall.

2100-With moon on the starboard side of convoy, raced ahead to attack from the port side to avoid Besugo being silhouetted by the moonlight.

2101-2150-Convoy formation made difficult to get in for proper shot. Four merchants are in one single column about 1800 yards apart with nine escort type vessels encircling them at about 3000 yards. In a peculiar manner, two escorts are forming an inside screen on the flanks of the merchants, preventing a clear and close shot.

2155-Fired two Mark 16's from 4100 yards at WATANABE MARU 3800 tons.

2157-Both torpedoes impacted, freighter exploded. Quickly moved to avoid a Type D escort closing in on Besugo.

2210-With convoy somewhat scattered as three escorts remaining hunting for Besugo at scene or prior attack, worked way inside the screen and targeted a SAKITO MARU 8950 ton troopship. Target was zigging so close range shot would be required.

2234-A Type A Shimiushu Class Escort (lead escort which had lagged behind after first attack) increased to high speed to get back in front of the merchants, escort would soon be within 3000 yards.

2241-Fired four Mark 14 torpedoes at SAKITO MARU from 2100 yards.

2242-Three torpedoes hit the troopship, which slowed, and listed heavily, afire amidships. Besugo was already racing away, avoiding ships to get the deeper waters. A radar equipped Minesweeper Type escort began chasing Besugo from 4000 yards, several shells landed in wake. Soon ceased fire but continued pursuit.


2248-Avoided a large freighter and escort nearby, continued to slip out. A SEITO MARU class tanker was observed. Set up to bring stern tubes to attack but tanker spotted Besugo at 2300 yards and illuminated with spotlight, opening fire. Besugo turned west to exit the convoy and into deeper waters, under fire. Gunfire ceased but spotlight maintained lock on Besugo, apparently guiding escorts from astern, port, starboard, and most disturbingly, ahead.

2250-Best option was to try and slip past the escort closing from ahead. In case of emergency and since unable to dive in such shallow waters, ordered 5 inch, 40 and 20 MM guns manned, would as a last resort, fight out way out as the one escort was the. All bow torpedo tubes were emptied and could not be reloaded in time for a down the throat shot.

2251-APR-1 detected radar signals from ahead, this escort had Besugo locked.Realizing would not be able to slip past him, turned to present a zero angle on the bow to escort to provide narrow target at 3000 yards, Besugo closing at 21 knots.

2253-Escort illuminated Besugo with spotlight and opened fire. Ordered 5 inch and 40 MM guns to open fire. As range crew close the escort's main guns appeared unable to hit the Besugo due to close range, while some of her auto cannon/machine guns did score hits. Besugo's 5 inch gun scored 6 solid hits and numerous 40 and 20 mm hits. The escort caught fire amidships and in the game of "chicken" flinched first turning slightly to port. Besugo slid alongside at less than estimated 10-12 feet. The 20 MM gun raking the deck. Racing away the escort did not fire and slowed, unsure of the vessels fate.

With the escort eliminated, Besugo was free of the trap. The other escorts opened with with shells landing in vicinity but in the darkness lost contact. One radar equipped DE type continued pursuit for 20 minutes, then turned back.

0100-Now in deeper waters, maintaining intermittent SJ contact, torpedoes were reloaded.

0200-Regained SJ contact. Seeing a chance for one more attack before dawn, moved in, dodging escorts and a night patrol plane.

0251-SEITO MARU tanker 6500 tons was in crosshairs of aft TBT. Fired 3 MK 18 torpedoes from 3000 yards. All three hit, setting off the (apparently) fuel loaded tanker in a massive fireball and explosions. Escort at 2700 yards immediately opened fire as Besugo was now visible thanks to the star shells and light of explosion in addition to the light fog had lifted, giving the half moon lit night better visibility.

0321-Escort lost contact. Besugo set course to West then SW to clear convoy and shallows by dawn.


23 July- Sunk several armed fishing boats in gun action


24 July- Sunk small coastal cargo vessels in gun action off approached to Bangkok.

25 July-29 July-
Foul weather enveloped area.

29 July- Bombed by aircraft off Cau Mau Peninsula, minor damage.


30 July-

0821- While on patrol 5 NM off coast in Western Gulf of Siam..SJ made contact on a convoy at 11 NM. with 200 feet of water in this deep "patch" and choppy seas, opted for submerged attack. Convoy was two ships with 6-7 escorts of PC type, one Hatsutaka Minelayer was observed guarding convoys rear.


0851-Prepared to fire remaining four Mark 18 torpedoes in forward torpedo room at a large and mid sized freighter. Suddenly, pinging began. A small auxiliary PC type escort previously unobserved had closed in and was 1200 yards in Besugo's baffles. Convoy alerted slowed and ruined the set up. However, the lead freighter (BIYO MARU) was just 2000 yards. Quick plot assumed 5.5 knots zigging. Set up and fired two Mark 18's from tubes 1 and 3. After firing, ordered dive to 200 feet at flank speed, with a turn to the south. SBT-1 decoys deployed at 75 100 and 150 feet.

0853-Two torpedo impacts heard. Believe hit the lead freighter.

0854- As passed 190 feet, four depth charges (presumably from the small PC) exploded above the Besugo. No damage.

Multiple escorts closed pinging. The combination of depth charge explosions, choppy seas, thermocline located at 192 feet seemed to help besugo escape.


0908-A PC seemed to locate Besugo and came overhead, dropping 5 depth charges. Two exploded somewhat close with small leaks in pipign and air lines in conning tower and control room. after batteries took minor damage.


This PC made 3 more runs. SBT-1 decoy seemed to through her off Besugo's trail .

0918-Another PC closed in, this was presumed to be the minelayer as it passed overhead at high speed and let loose a pattern of charges. Sound of Y or K guns was heard firing. The first pattern of charges was close, badly shaking the boat and causing minor damage.

0924-0950-Two more runs were made with no damage. MS seemed to lose contact after deploying of decoy and a high speed run but it once again located Besugo and laid a pattern of charges.

0952-Charges exploded close to Besugo, damage reported. Minor flooding in control room and crew berthing, trim and hydraulic pumps damaged, batteries damaged. Continued high speed evasive movements and deployed two more decoys.


Several more runs were made by the escorts but none as close. By 1300 all was quiet. At 1400-came to periscope depth. Nothing in sighted. At radar depth, SJ sweep had one contact. Surfaced and closed to find the BIYO MARU torpedoed earlier dead in the water. Closed to finish off with deck gun, thinking it odd the ship was left there without a guard. However, a patrol could be en route so moved quickly.

Soon after SV had a contact. Aircraft observed in distance, forced to dive and move in submerged. The plane was circling the stricken freighter, which was listing to starboard and dead in water but afloat. Went to 125 feet and closed on the BIYO MARU.

1531-Came to periscope depth at 5000 yards. No aircraft detected. Scope down and depth 90 feet until reached estimated position 3000 yards off target.

1548-At periscope depth, prepared to fire when observed a large flying boat above the target, turning fast towards Besugo. Quickly fired remaining two MK 18 torpedoes from forward tubes, and ordered a dive. As passed 100 feet, two explosions occurred near Besugo's stern, no damage reported.

1550-Two torpedoes impacted. Sounds of ship breaking up. BIYO MARU sunk at 1554.

Heading south at 190 feet, several more explosions went off but not close. The plane was likely MAD equipped and following Besugo. At 1651 sounds of fast screws approaching were heard, seems a coastal patrol was called in. Evaded the vessels on silent running. Plane apparently lost contact as well.

1940-Surfaced into dusk skies. Three torpedoes left in stern tubes.2 Mark 18 one MK 27.


31 July-

0901- Encountered 8 fishing boats, all armed. These boats opened fire. In a running gun battle, sunk all boats. Exhausted 20 MM ammo aboard.

31 July-2321-Off Cau Mau Peninsula, SJ contacted a small convoy of two ships with 7 PC escorts. Night was very dark with no moon. However, the screen was such it made gaining a proper firing position difficult.

1 August-

0024-Set up on SEIA MARU 7200 tons from 3300 yards for MK 18's and on a gunboat type escort (ATAMI) with MK 27 from 2200 yards. Due to speed differential and range would fire MK 27 first.

0030-Fired MK 27 at gunboat.

0031-Fired MK 18(two) at SEIA MARU.

0033-Gunboats course and speed change caused one MK 18 (set shallow) to hit him, the gunboat was obliterated.

0034-MK 18 hit the SEIA MARU setting it afire after two large explosions.

Turned away at high speed undetected in the darkness, although the lead escort appeared to have Besugo on radar for a time as it pursued.Out of torpedoes, Besugo set course to depart area.


0039-the MK 27 apparently impacted an unknown vessel. Results unknown.



6 August-Arrived Subic Bay.


(After docking, received news the war had ended with the cut screens and video, which I do not recall seeing before.)


Probably one of my favorite careers ever in SH 4. Seven war patrols between September 1944 and August 1945.


Few screen shots:












Last edited by Bubblehead1980; 06-23-21 at 07:58 PM.
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