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9,570 Tons (standard)
475' 9" x 470' 10" x 19' 10"
145m x 19m x 605m
4 x 120mm AA guns
10 x Type 96 AA guns
Peter Ording 2002
On January 14, 1942 departs Hashirajima with 500 tons transporting vegetables and food stores, making stops at Davao and Staring Bay, Celebes, Truk, and Saipan and loads 80 tons of sugar then proceeds to Hashirajima, arriving on February 7, 1942.
On March 8, 1942 provisions Patrol Boat PB-1 at Kendari. Two days later provisions Asahi Maru with food and 250 tons of coal at Staring Bay. On April 9, 1942 provisions Auxiliary Gunboat Okuyo Maru at Macassar. The next day, Captain Tomizawa Fujihiko is appointed commanding officer of Irako.
On May 6, 1942 departs Singapore escorted by Hatakaze arriving to Yokosuka nine days later. On August 9, 1942 transits Bungo Straits and again on September 28, 1942
On November 3, 1942 Irako is escorted by Nasami off Fukajima southward 32° North Latitude before departing and Irako proceeded to Truk. On November 9, at 10° North Latitude escorted by Asanagi to Truk arriving the next day.
On November 24, 1942 departs Truk escorted by Oite, the next day proceeds alone towards Japan. On November 30, escorted by Nasami through the Bungo Straits to Fukajima. On December 13, 1942 escorted by Nuwajima off Mizunoko lighthouse until reaching Toi Misaki the next day.
During 1943, Irako makes twelve round trips from Japan to Truk.
On January 12, 1943 departs Truk traveling via Bungo Straits with Zuikaku, Suzuya, Ariake, Yugure and Amagiri and Jingei. On January 23, 1943 joined by torpedo boat Hato and CH-39 off Mizunoko Lighthouse, with CH-39 detached the next day before arriving at Truk. On February 2, 1943 provisions Sanyo Maru and seven days later again provisions the same vessel then departs for Japan.
Afterwards, departs Truk and on March 5, 1943 escorted by torpedo boat Hato south through the Bungo Straits
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On January 4, 1944 departed Yokosuka escorted by Shigure and Harusame bound for Truk arriving seven days later. On January 13, 1944 at Truk, provisions Heian Maru and again provisions her three days later.
On January 20, 1944 departs Truk escorted by Satsuki, Akebono and Ushio. At roughly 8' 4" N, 152 40" E hit by a torpedo fired by USS Seadragon (SS-194) northwest of Truk. Hit in the starboard bow that causes medium damage and flooding in the bow and leaves the vessel adrift off the North Passage. Suzukaze departs Truk to assist.
On January 21, 1944 Chokai tows Irako back to Truk escorted by Suzukaze and Ushio, arriving at 5:00pm. Undergoes temporary repairs, likely by Akashi until early Febraruy 1944
On February 13, 1944 departs Truk as part of convoy 4213 including Notoro, Tatsuura and Hibi Maru escorted by Manju, Oki and CH-31 arriving at Yokosuka on February 27, 1944.
On March 3, 1944 Irako undergoes repairs at Yokosuka and then is transfered to Mitsubishi Heavy Industries at Yokohama and Sasebo Arsenal for additional repairs until August 1944.
On July 5, 1944 assigned to the Southwest Area Fleet at Manila.
On August 10, 1944 departs Imari Bay as part of convoy HI-71 bound for Singapore. The convoy includes oilers AZUSA, KYOKUTO, TEIYO, EIYO, ZUIHO, AMATSU and NIYO MARUs, HAKKO MARU No. 2, fleet oiler HAYASUI, transports TEIA (ex-French ARAMIS), AWA, NOTO, HOKKAI and NOSHIRO MARUs, IJA landing craft depot ships TAMATSU and MAYASAN MARUs and cargo ships KASHII, NISSHO and ORYOKU MARUs escorted by destroyers FUJINAMI and YUNAGI, kaibokan HIRADO, KURAHASHI, MIKURA, SHONAN, CD-11 and escort carrier TAIYO. The 631st NAG provides air cover with 12 BN5 “Kates”.
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On August 29, 1944 arrives at Takao Harbor and departs the same day and arrives at Tsoying on Formosa.
On August 30, 1944 off Saei on Formosa, the convoy splits with KIBITSU Maru, GOKOKU Maru, KAGU Maru and Irako proceed to Manila Bay while the rest of the convoy proceeds to Singapore.
On September 21, 1944 U. S. Navy (USN) carrier aircraft attack Manila Bay. Anchored near Irako, Satsuki was sunk.
On September 22, 1944 at 3:00am departs Manila Bay carrying a load of reconnaissance floatplanes as part of a Taihi (refugee) convoy bound for Coron Bay along with CHINZEI, BAIKAL, Taiei Maru, TENHI, TAITEN, Olympia Maru, EKKAI and KOGYO MARUs escorted by minelayer AOTAKA, auxiliary subchasers SHONAN MARU No. 11 and HAKKO MARU, CHa-60 and CHa-61. Arriving at Coron Bay. Irako anchors between Tangat Island and Lusong Island.
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