Question: During the Pacific war, what did the nation that is the basis for the ethnic background of the Shib Sibs, fail to capture?

full_context: Document 1: Aimi Kobayashi: She lived in Ube, Yamaguchi Prefecture, Japan until February 2007 and later in Tokyo, started learning the piano at the age of three, played with an orchestra at age seven, and has been receiving tutelage from Yuko Ninomiya since the age of eight.
Document 2: Maia Hirasawa: She was born and raised in Sollentuna, Stockholm, Sweden but has lived for many years in Gothenburg. Maia became known through Annika Norlin's band Hello Saferide, where she is a back-up singer. Her solo career began in early 2007 when the song "And I Found This Boy" started being played heavily on Swedish radio. The single was followed up by the album "Though, I'm Just Me" and the single "Gothenburg". During the summer of 2007 she toured around Sweden, playing at such shows as Allsång på Skansen, Hultsfredsfestivalen, Peace & Love and Arvika Festival. In 2010 she for the first time released material in Swedish with the EP "Dröm bort mig igen".
Document 3: Pacific War: Two battle-hardened Australian divisions were steaming from the Mid-East for Singapore. Churchill wanted them diverted to Burma, but Curtin insisted on a return to Australia. In early 1942 elements of the Imperial Japanese Navy proposed an invasion of Australia. The Japanese Army opposed the plan and it was rejected in favour of a policy of isolating Australia from the United States via blockade by advancing through the South Pacific. The Japanese decided upon a seaborne invasion of Port Moresby, capital of the Australian Territory of Papua which would put Northern Australia within range of Japanese bomber aircraft.
Document 4: Gina Rodriguez: Gina Alexis Rodriguez was born in Chicago, Illinois, the youngest daughter of Puerto Rican parents: Magali and Genaro Rodríguez, a boxing referee. She is the youngest of three sisters. She was raised in the Belmont Cragin neighborhood on Chicago's Northwest Side. At the age of seven, Rodriguez performed at the salsa dance company Fantasia Juvenil. Rodriguez was raised Catholic, and attended high school at St. Ignatius College Prep. She continued dancing salsa until age 17.
Document 5: Pacific War: The war entered a new phase with the unprecedented defeat of the Japanese at Battle of Suixian-Zaoyang and 1st Battle of Changsha. After these victories, Chinese nationalist forces launched a large-scale counter-offensive in early 1940; however, due to its low military-industrial capacity, it was repulsed by Japanese army in late March 1940. In August of 1940, Chinese communists launched an offensive in Central China; in retaliation, Japan instituted the "Three Alls Policy" ("Kill all, Burn all, Loot all") in occupied areas to reduce human and material resources for the communists. By 1941 the conflict had become a stalemate. Although Japan had occupied much of northern, central, and coastal China, the Nationalist Government had retreated to the interior with a provisional capital set up at Chungking while the Chinese communists remained in control of base areas in Shaanxi. In addition, Japanese control of northern and central China was somewhat tenuous, in that Japan was usually able to control railroads and the major cities ("points and lines"), but did not have a major military or administrative presence in the vast Chinese countryside. The Japanese found its aggression against the retreating and regrouping Chinese army was stalled by the mountainous terrain in southwestern China while the Communists organised widespread guerrilla and saboteur activities in northern and eastern China behind the Japanese front line.
Document 6: Mimi Kuzyk: Kuzyk was born in Winnipeg, Manitoba to Fred and Kay Kuzyk, both of whom are Ukrainian immigrants, and received her early education at the Immaculate Heart of Mary School. She danced with the Rusalka Ukrainian dance group in Winnipeg for 12 years and briefly studied jazz dance at the Royal Winnipeg Ballet School.
Document 7: Jenette Maitz: Jenette Maitz (born December 7, 1987) is an American former competitive ice dancer. In 2009, she teamed up with Turkish skater Alper Uçar, coached by Natalia Dubova. They won the Turkish national title and represented Turkey at the 2010 World Championships, placing 26th.
Document 8: Pacific War: As many Japanese had feared, Japan's supply arrangements could not maintain her forces. Once Mutaguchi's hopes for an early victory were thwarted, his troops, particularly those at Kohima, starved. During May, while Mutaguchi continued to order attacks, the Allies advanced southwards from Kohima and northwards from Imphal. The two Allied attacks met on 22 June, breaking the Japanese siege of Imphal. The Japanese finally broke off the operation on 3 July. They had lost over 50,000 troops, mainly to starvation and disease. This represented the worst defeat suffered by the Japanese Army to that date.[citation needed]
Document 9: Pacific War: In January, Japan invaded Burma, the Dutch East Indies, New Guinea, the Solomon Islands and captured Manila, Kuala Lumpur and Rabaul. After being driven out of Malaya, Allied forces in Singapore attempted to resist the Japanese during the Battle of Singapore but surrendered to the Japanese on 15 February 1942; about 130,000 Indian, British, Australian and Dutch personnel became prisoners of war. The pace of conquest was rapid: Bali and Timor also fell in February. The rapid collapse of Allied resistance had left the "ABDA area" split in two. Wavell resigned from ABDACOM on 25 February, handing control of the ABDA Area to local commanders and returning to the post of Commander-in-Chief, India.
Document 10: Nathan Chen: Nathan Chen Nathan Chen at 2017 US Championships Full name Nathan Chen Country represented United States (1999 - 05 - 05) May 5, 1999 (age 18) Salt Lake City, Utah Height 1.66 m (5 ft 5 ⁄ in) Coach Rafael Arutyunyan, Nadia Kanaeva, Vera Arutyunyan Former coach Marina Zueva, Oleg Epstein, Evgenia Chernyshova, Stephanie Grosscup, Karel Kovar, Amanda Kovar Choreographer Shae - Lynn Bourne, Lori Nichol Former choreographer Nadia Kanaeva, Marina Zueva, Nikolai Morozov, Phillip Mills, Stephanie Grosscup, Evgenia Chernyshova Skating club Salt Lake Figure Skating Training locations Lakewood, California Former training locations Salt Lake City, Utah Lake Arrowhead, California Artesia, California Canton, Michigan Began skating 2002 World standing 3 (As of 24 March 2018) ISU personal best scores Combined total 321.40 2018 World Figure Skating Championships Short program 104.12 2017 Skate America Free skate 219.46 2018 World Figure Skating Championships Medal record (hide) Men's figure skating Representing the United States International competitions Event 1st 2nd 3rd Winter Olympics 0 0 World Championships 0 0 Four Continents Championships 0 0 Grand Prix Final 0 World Junior Championships 0 0 Junior Grand Prix Final 0 World Team Trophy 0 0 Total Olympic Games 2018 Pyeongchang Team World Championships 2018 Milan Singles Four Continents Championships 2017 Gangneung Singles Grand Prix Final 2017 -- 18 Nagoya Singles 2016 -- 17 Marseille Singles World Team Trophy 2017 Tokyo Team World Junior Championships 2014 Sofia Singles Junior Grand Prix Final 2015 -- 16 Barcelona Singles 2013 -- 14 Fukuoka Singles
Document 11: Guadalcanal campaign: In order to exploit the victory in the Battle for Henderson Field, Vandegrift sent six Marine battalions, later joined by one U.S. Army battalion, on an offensive west of the Matanikau. The operation was commanded by Merritt Edson and its goal was to capture Kokumbona, headquarters of the 17th Army, west of Point Cruz. Defending the Point Cruz area were Japanese army troops from the 4th Infantry Regiment commanded by Nomasu Nakaguma. The 4th Infantry was severely understrength because of battle damage, tropical disease, and malnutrition.
Document 12: Pacific War: The battle of Iwo Jima ("Operation Detachment") in February 1945 was one of the bloodiest battles fought by the Americans in the Pacific War. Iwo Jima was an 8 sq mile (21 km2) island situated halfway between Tokyo and the Mariana Islands. Holland Smith, the commander of the invasion force, aimed to capture the island, and utilize its three airfields as bases to carry out air attacks against the Home Islands. Lt. General Tadamichi Kuribayashi, the commander of the island's defense, knew that he could not win the battle, but he hoped to make the Americans suffer far more than they could endure.
Document 13: Maia Shibutani: Maia Harumi Shibutani was born on July 20, 1994, in New York City. She is the daughter of Chris Shibutani and Naomi Uyemura, both of Japanese descent, who met as Harvard musicians. She has an older brother, Alex Shibutani, who competes with her as her partner in the discipline of Ice Dance. She started figure skating at the age of 4 in 1998 in Old Greenwich, Connecticut, where she was a student at Greenwich Academy in Greenwich, Connecticut.
Document 14: Pacific War: The Japanese responded to the Allied attacks by launching an offensive of their own into India in the middle of March, across the mountainous and densely forested frontier. This attack, codenamed Operation U-Go, was advocated by Lieutenant General Renya Mutaguchi, the recently promoted commander of the Japanese Fifteenth Army; Imperial General Headquarters permitted it to proceed, despite misgivings at several intervening headquarters. Although several units of the British Fourteenth Army had to fight their way out of encirclement, by early April they had concentrated around Imphal in Manipur state. A Japanese division which had advanced to Kohima in Nagaland cut the main road to Imphal, but failed to capture the whole of the defences at Kohima. During April, the Japanese attacks against Imphal failed, while fresh Allied formations drove the Japanese from the positions they had captured at Kohima.
Document 15: Kelela: A second-generation Ethiopian American and an only child, Mizanekristos was born in Washington, D.C. on June 4, 1983. Growing up in Gaithersburg, Maryland, she learned to play the violin in fourth grade and sang in her school's choir. In 2001, she graduated from Magruder High School. After transferring from Montgomery College to the American University, Mizanekristos began singing jazz standards at cafés. In 2008, she joined an indie band called Dizzy Spells and sang progressive metal after meeting Tosin Abasi, whom she later dated. In 2010, she moved to Los Angeles, where she currently lives, in addition to London.
ground_truth: defences at Kohima
sub_queries: what is the ethnic background of the shib sibs Answer: Japanese
What had the Japanese failed to capture? Answer: defences at Kohima