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Old 06-09-08, 05:09 AM   #1
keltos01
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Default IJN Campaign - notes and infos

Here's the start of the gathering of intel that'll lead to a real IJN campaign mod for SH4 ver 1.5 :

Here are a few notes to start an IJN Campaign,it covers operations of different types of subs by date, when known the sub's number and mission are added.

Midget Sub Ko Hyoteki :
Pearl harbor 7 December 1941
5 attack Pearl harbor, one gets inside, all lost

Sidney 31 May 1942:
3 attack
Diego Suarez Madagascar 30 May 1942
2 attack harbor
Guadalcanal November 1943
based on Shortland Island, off the south en of Bougainville to attack US forces on Guadalcanal.


Other types of Boats :

24 August 1943
I 25 reconnoiters Espiritu Santo Island. sunk there by USS Patterson DD 392.


Late 1944
in the aftermath of the Leyte Gulf Defeat the IJN submarine forces engaged in various operations and different schemes in order to save their force.
Submarines were thrown into local areas such as the Philippine sea, the Leyte Gulf, Iwo Jima and Okinawa, attacking very well protected assault forces regardless of the losses.
A few of the coastal defence subs (incl. Kaisho subs) continued to patrol around the northern and central philippines after october.
RO-115 (902-9-1945) was sunk on the way from Manila to Takao by USS Batfish RO-112 (02-10-1945)and RO 113 (02-12-1945) were sunk by USS Batfish as well.

feb 19 1945 Iwo Jima
Sortie to attack the us forces there.
RO-43 3 kaiten
I-44 4 kaiten
I-368 I370 5 kaiten

April 1 1945 Okinawa
RO-41
Ro-49
RO-56
I-8 Jyunsen type 3

May 1945
I-361 okinawa
I-165 Saipan
Giant submarines operations( I 400):
attack us forces at Ulithi atoll I-13 and I-14.
I 13 left Ominato for Truk on 11 July, sunk on 16 July.
July 1945
I 58 sortied from the inland sea on 18 July for the P¨hilippine sea, between Guam and Leyte and Okinawa-Palau sank USS indianapolis.
I 53 sortied 14 July for a patrol along the Okinawa-Palau and Okinawa-Mariana lines.
I-369
I-367
I-369 transport to Truk
I-351 sunk off Borneo 15 July by Bluefish (SS-222)
I-373 sunk Augsut 14 by the USS Spikefish (SS-404) in the East China Sea at Daybreak.
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Old 06-11-08, 10:23 AM   #2
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Default Tin Cans

Im currently reading Tin Cans, an abridged version of US destroyers ops in WW2.

will comply some IJN kill data by DD to send to you, they usually say were the sub was coming from, which sub and date.:hmm:
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Old 06-11-08, 10:26 AM   #3
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I recently made a database (Again, For a school project) which has all I could find on the ships that participated and/or sunk in the Solomon Islands campaign, Including Submarines wherever I could find data on them, I'll try to compile something too and post it
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Old 06-11-08, 10:41 AM   #4
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Okay, I got some data on sinkings:

I-7, a J3, was scuttled on 24/06/1943 (Can't remember why)
I-22, a C1, disappeard mysteriously (Last contact 12/11/1942)
I-19, a B1, was sunk by USS Radford (DD-446) on 25/11/1943 (NOTE: This submarine sunk the USS Wasp (CV-7) on 15/09/1942)
I-17, a B1, was damaged by the Bird-class Minesweeper HMNZS Tui and finished off by VS-57s Kingfishers on 19/08/1943

I'll have more including those which did not sink later
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Old 06-28-08, 03:15 AM   #5
keltos01
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Quote:
Originally Posted by Raptor1
Okay, I got some data on sinkings:

I-7, a J3, was scuttled on 24/06/1943 (Can't remember why)
I-22, a C1, disappeard mysteriously (Last contact 12/11/1942)
I-19, a B1, was sunk by USS Radford (DD-446) on 25/11/1943 (NOTE: This submarine sunk the USS Wasp (CV-7) on 15/09/1942)
I-17, a B1, was damaged by the Bird-class Minesweeper HMNZS Tui and finished off by VS-57s Kingfishers on 19/08/1943
I'll have more including those which did not sink later
excellent, since no one can help me with making mines I might just make a C class boat next time, the C1 class had eight tubes forward ! and 20 torpedoes. 5 were built none survived.

intel :http://homepage2.nifty.com/nishidah/e/stc0535.htm
The C2 Class had eight tubes forward ! and 20 torpedoes. 3 were built one survived.

The C3 Class had six tubes forward ! and 19 torpedoes. 3 were built one survived.

the one with 6 tubes forward and 2 aft,
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Old 06-28-08, 10:01 PM   #6
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Default fate of I-7

Quote:
Originally Posted by Raptor1
Okay, I got some data on sinkings:

I-7, a J3, was scuttled on 24/06/1943 (Can't remember why)
I-22, a C1, disappeard mysteriously (Last contact 12/11/1942)
I-19, a B1, was sunk by USS Radford (DD-446) on 25/11/1943 (NOTE: This submarine sunk the USS Wasp (CV-7) on 15/09/1942)
I-17, a B1, was damaged by the Bird-class Minesweeper HMNZS Tui and finished off by VS-57s Kingfishers on 19/08/1943

I'll have more including those which did not sink later
I found this on your I-7 , hope it helps
http://www.combinedfleet.com/I-7.htm

20 June 1943:
The I-7 makes a landfall off Kiska, but LtCdr Nagai decides not to enter Gertrude (Tanabata) Cove in Vega Bay because of a dense fog. He contacts the 51st Base Unit on Kiska and learns that the radio beacon will be deactivated after 0100, 21 June.


21 June 1943:
At 1330 (I), the I-7 surfaces in a heavy fog and proceeds towards the anchorage at Gertude Cove. LtCdr P. H. Horn's patrolling USS MONAGHAN (DD-354) picks up the I-7 on her SG radar at 13,000 meters and tracks it until about 1400. One mile S of the anchorage, she opens radar-directed fire. The shelling comes in from the starboard side of the I-7 and lasts about 10 minutes. The I-7 takes two 5-inch direct hits that rip her decks and devastate the conning tower. LtCdr Nagai, Captain Tamaki, Navigator Lt Hanabusa Yoshio and three other crewmen are killed and the communications officer is wounded. The pressure hull is penetrated in the conning tower area and the main ballast tanks are holed. The I-7 fires back with her 13.2 mm machine guns. The damage to the I-7 is such that she is unable to submerge. The Exective Officer, Lt Sekiguchi Rokuro takes command. At 1515, he runs the I-7 aground at Bukhti (Asahi) Point.

Earlier, the 51th Base Force sent a Daihatsu barge to unload the I-7's cargo. The Daihatsu, sailing in the thick fog, tries to contact the I-7 using a blinker gun. Instead, she receives a hail of machine gun bullets from the MONAGHAN that had spotted this new target 40 minutes after her last shot at the I-7. The barge doubles back, informs HQ of the I-7's grounding and then returns to the submarine. She takes aboard an officer from the I-7 who coordinates the unloading efforts.


22 June 1943:
By 0300 (I), with the help of a group of IJA soldiers, the I-7's cargo is unloaded at Hita Bay. During that time, the water is pumped out. By 1445, the I-7 is refloated and moved to the entrance of Gertrude Cove. By 1830, emergency repairs are completed but the submarine is still unable to submerge. After a brief discussion Lt Sekiguchi decides to return to Paramushiro on the surface since the I-7's speed is not impaired.

At 2000, the I-7 starts back to Yokosuka. She makes only about 10 miles when at 2125 she is suddenly attacked by no less than three vessels from all forward quadrants. In the next few minutes, she takes more hits in the conning tower while firing back from her guns and machine guns. The acting CO Lt Sekiguchi, Engineering Officer Lt Handa Masao and Lt (j.g.) Mori Yoshisaburo are killed as are many crewmen. The submarine makes a U-turn at full speed. During this second engagement, the I-7 fires 70 of her main caliber shells and about 1,000 machine-gun rounds.

The Chief Gunnery Officer, Lt (j.g.) Shindo Yoshio assumes command and cons the submarine from her wrecked conning tower. The I-7's lookouts spot what they take to be a small fire on one of the attackers. For a while it is thought that the enemy has lost contact, but star shells are sighted and the Japanese sailors decide there is no way to escape.

At 2300, Shindo runs the I-7 aground on the Twin (Futagoiwa) rocks. Fifty feet (15 meters) of the bow protrude out of the water and she develops a heavy list to port. The I-7's stern remains intact in only 100 feet of water. Forty-three survivors (including 10 wounded) are evacuated by another Daihatsu.

23 June 1943:
S of Kiska Harbor. The I-7 is abandoned at Vega Bay at 51-49N, 177- 20E. Eighty-seven officers and crewmen are killed. A bag containing code books and other secret documents is left suspended on a ladder at her No. 3 after access hatch, but her crew makes no attempts to scuttle her.

24 June 1943:
A Daihatsu from Kiska scuttles the bow of the I-7 in the midst of the fog, using demolition charges. The crew attempts to locate the code books prior to the scuttling, but fails to retreive them. The explosion breaks the hull of the submarine into two parts. Captain Tamaki is promoted Rear Admiral, posthumously and LtCdr Nagai is promoted Commander, posthumously.

20 August 1943:
Removed from the Navy List.

26 August 1943:
The fleet tug USS UTE (ATF-76) is sent to investigate the reported sinking. Her divers find the submarine lying on her port side in 10 fathoms of water. The conning tower is damaged but the I-7's hull number is visible on a tarp on the side of the conning tower.

7 September 1943:
The submarine rescue ship USS FLORIKAN (ASR-9) arrives at Kiska from Midway. She carries out a month-long diving operation on the I-7's hulk. Seven divers enter the submarine and recover important intelligence documents.
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Old 06-28-08, 10:17 PM   #7
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Kiska? What the hell was it doing in my DB then?

Ahh...w/e
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Old 06-28-08, 10:39 PM   #8
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By you own admission Raptor1, you stated that the boats that participated and/or sunk in the Solomons Campaign. The I-7 was very active in the beginning of the campaign. In October 1942, I-7 shelled Esprito Santo twice and also conducted an aerial recon and periscope recon of the same.

I-7 TROM
http://www.combinedfleet.com/I-7.htm

More I-7 information
http://users.bigpond.net.au/ijnsubsi...etails/I-7.htm
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Old 06-28-08, 10:45 PM   #9
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Whoops, yeah, that makes sense

Been a while since I slept, so I was kinda confused because I'm tired
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Old 06-28-08, 11:18 PM   #10
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Been there, done that. When you start hallucinating, it is time for bed.
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Old 06-29-08, 03:08 AM   #11
keltos01
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Default I 7

so all we need now is someone like Peabody to write us a campaign with that data ? We already have three different japanese subs to choose from, the Kaidai 4 I made is the closest ship to the I 7, I could transform her to have 6 tubes forward I think, in a little while though as it's not the only project I'm working on.
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Old 09-30-08, 01:20 AM   #12
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Default The Philippines and Dutch East Indies operations

Philippines :

a rather lackluster operation for the submarines... only two minelaying subs I23 and I 24 of squadron 6 were in support of the attack :
thier mission was to patrol the waters around Luzon to support air assault by rescuing japanese pilots shot down, and to lay mines. The I23 layed 40 mines at the east end of Manilla bay and the I24 layed 39 in Balabac straight between Palawan and Borneo. Only the I24 sank a small cargo ship on 10 December.

December 23-24, 1941
I-66 (Cdr. Yoshi tome) sank the Dutch submarine K-XVI (Lt. Cdr. L.J. Jarman) while it was returning from attacking Japanese shipping near Kuching.

Dutch East Indies : started Dec 26 1941.

I1 through I7 took part. They were to patrol their asigned areas to detect enemmy retreats or reinforcements and to attack any enemy ship sighted.

group A Java sea and Sunda straight (six fleet subs, two coastal subs, four minelaying subs)

group B Bay of Bengal (six fleet subs)

group C east coast of the Celebes then between java and Australia. (seven ocean cruising subs I1 through I7)

January 4-9, 1942

The IJN's Subron 4 (Rear-Admiral Etuzo Yoshi tomi) submarines attacked shipping in the Netherlands East Indies.
I-57 (Cdr. Nakashima) sank one ship of 3077 tons and I-56 (Cdr. Ohashi) sank three ships of 7957 tons and torpedoed two more of 5065 tons south of Java.
I-58 (Cdr. Kitamura) sank one ship of 2380 tons in the Java Sea.
I-55, RO-33, and RO-34 are unable to sink any ships in the Anambas area.

January 9 - February 9, 1942
I-65 (Lt.Cdr. Harada) operated in the Java Sea and then off Rangoon and sank two ships of 6105 tons.
I-66 (Cdr. Yo****ome) operated in the Java Sea and then off Rangoon and sank three ships of 10530 tons
I-59 (Cdr. Yoshimatsu) sank one ship of 4184 tons south of Java and one unidentified ship near Sabang.
I-60 is sunk by the British Royal Navy (RN) HMS Destroyer Jupiter in the Sunda Strait on January 17.


Japanese submarine I-60

January 21-25. 1942
I-55, I-59, I-62, I-64, I-65, and I-66 formed a patrol line in the Ambon Sea to cover the Kendari Landings.


February 4-18, 1942
I-55 (Cdr. Nakajima) sank one off Java and one ship near Makassar for a total of 6546 tons. The I-55 reported sinking two more ships, but these are unconfirmed.
I-56 (Cdr. Ohashi) sank one ship of 979 tons and another unidentified ship in the Sunda Strait.

February 5-7, 1942
RO-34 (Lt.Cdr. Ota) encounters a Royal Navy force consisting of the HMS cruiser Exeter, HMS destroyers, Encounter and Jupiter, with the Royal Australian Navy cruiser (RAN) Hobart, NW of the Sunda Strait, but is unable to make a successful attack.
RO-34 also attacked and missed a Dutch Destroyer in the same area.

February 9-17, 1942
The IJN deployed Subron 4 against the merchant ships loaded with refugees from Singapore, which are proceeding to Sumatra and Java. The merchant ships are escorted by the HMS cruiser Durban, the HMS destroyers Jupiter and Stronghold, and RAN corvettes.
I-55 (Lt. Cdr. Nakajima) sank the ammunition ship Derrymore (4799 tons) N. of the Sunda Strait.
I-56 (Cdr. Ohashi) torpedoed a ship from convoy JS.1 in the Sunda Strait.

Japanese submarine I-55





Japanese submarine I-53






Japanese submarine I-58


info found on : http://www.geocities.com/dutcheastindies/jap_subs.html
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Old 09-30-08, 01:43 AM   #13
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I think an in depth Guadalcanal camp would be fun, or the opening moves of the US West Coast.
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Old 09-30-08, 02:55 AM   #14
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Default Submarine reconnaissance for carrier strike force in the Indian Ocean

Submarine reconnaissance for carrier strike force in the Indian Ocean :

Vice admiral Nagumo returned from Pearl to japan for supplies after the
air assault there to prepare for the next operation : a dash in the
indian Ocean with air attack planned against Trincomalee, Columbo and Ceylon.
Combined fleet headquarters wanted submarines to reconoiter enemy waters
around Ceylon and the west coast of India.

Submarine Squadron 2 (I1 through I7) commanded by Rear adm. Hisashi Ichioka,
was assigned the mission.

None of these boats had a clean cut mission other than to reconnoiter for
air strike operations. I7 sank the 9,415 ton British Gelnshiel.

I4, I5, I6 patrolled along the west coast of india, near the Maldives,
I 5 near cape Cormorin and the southern tip of India, I 6 off Bombay.
7 cargo ships sunk.
air results :

HMS Hermes light aircraft carrier sunk
HMS Cornwall and HMS Dorsetshire heavy cruisers sunk. There was
subsequently no effective british naval shield covering the western
and northwestern approaches to Australia.
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Old 09-30-08, 03:12 AM   #15
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Default The Midway and Aleutians operations :

The midway and aleutians operations :
The japanese navy lacked plans after the southern important territories
were occupied in April 1942. Yamamoto advocated more offensive operations
such as the invasion and occupation of the hawaiian islands.
The navy advocated expansion to the southeast, the occupation of Fiji
and the Samoan islands would cut off Australia from the US.
The initial goals of these operations were the occupation of Midway,
Port Moresby in Papua New Guinea, and the ALeutians. The purpose was
to establish a defensive line far from the heart of the empire.

MI
Ten submarines of the third and first submarine groups were assigned to
picket lines A and B, to the north and to the south of the French Frigate Shoals,
for interception of US naval forces en route to Midway.
They should have been there May 30th, but were late, thus arriving after the
US forces had gone through the area.

The loss of 4 aircraft carriers on 4 june was devastating to the japanese
navy but Yamamoto still hoped that the submarines could deliver a fatal
blow to the US forces around Midway. Their picket line was east of midway
along meridian 168-40 w. they were then moved west of midway then back east but
not in time to catch the US carriers en route to Hawaii.
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