Question: Which war was Liu Buchan's actions the most prominent?
Context: Ma Chao (176–222), courtesy name Mengqi, was a military general and warlord who lived in the late Eastern Han dynasty and early Three Kingdoms period.  A descendant of the general Ma Yuan, Ma Chao was the eldest son of Ma Teng, a prominent warlord in Liang Province (covering parts of northwestern China).  In 211, he formed a coalition with Han Sui and other northwestern warlords and revolted against the Han central government, which was led by the warlord Cao Cao.  The coalition broke up after losing the Battle of Tong Pass against Cao Cao's forces.  Ma Chao initially retreated, but later returned to attack and seize control of Liang Province by killing the provincial inspector Wei Kang and forcing Wei Kang's subordinates to submit to him.  About a year after Ma Chao started his uprising, Emperor Xian issued an imperial decree ordering the execution of Ma Chao's family members, who were in Ye city at the time.  In the meantime, Wei Kang's subordinates, led by Zhao Ang, Yang Fu and others, rebelled against Ma Chao and forced him out of Liang Province.  Ma Chao retreated to Hanzhong Commandery, where he borrowed troops from the warlord Zhang Lu, and returned to attack Liang Province but was ultimately defeated and driven back.  Ma Chao took shelter under Zhang Lu for a while until around 214, when he heard that the warlord Liu Bei was fighting for control over Yi Province (covering present-day Sichuan and Chongqing) with Yi Province's governor, Liu Zhang.  He defected to Liu Bei's side and assisted Liu Bei in capturing Yi Province from Liu Zhang.  Ma Chao had served as a general under Liu Bei since then and participated in the Hanzhong Campaign in 219.  He died in 222. The Buchan Bakers was an amateur basketball team located in Seattle, Washington and competed in the National Industrial Basketball League.  The Bakers were one of the most popular teams of the Amateur Athletic Union, rising to fame in 1957 when the beat the Phillips 66ers in the AAU Tournament final.  The team was sponsored by the Buchan Baking company, thus they adopted their name.  During the 1955-56 season, the Buchan Bakers traveled to Asia, playing teams from Japan, China and They were the first AAU basketball team to play against Eastern European teams during the Cold War. Emperor An of Jin (; 382–419), personal name Sima Dezong (司馬德宗), was an emperor of the Eastern Jin Dynasty (265-420) in China.  He was described as so developmentally disabled that he was unable to speak, clothe himself, or be able to express whether he was hungry or full.  He was created crown prince in 387 and ascended the throne in 397.  Because of his disability, the actual power was controlled by his uncle, Sima Daozi, Prince of Kuaiji.  During his reign, regents and warlords dominated the Jin regime.  Revolts by various governors also ravaged the land.  From 398 to 403, there were constant revolts and civil war campaigns.  In 403, the Jin regime was usurped by the warlord Huan Xuan, and while Emperor An was restored in 404, the Jin Dynasty was nearing its end.  With the warlord Liu Yu as the actual power, Jin destroyed Southern Yan and Later Qin, greatly expanding its territory.  However, with Liu Yu up in the north, the renegade governor of Guang Province (廣州, modern Guangdong and Guangxi), Lu Xun, rebelled and threatened the capital city Jiankang, before Liu Yu returned and crushed the revolt.  In 419, Emperor An was strangled under the order of Liu Yu and replaced with his brother Emperor Gong, who would be the last emperor of the dynasty, before Liu Yu would take the throne and establish the Liu Song Dynasty. Liu Buchan () was a naval officer of the Beiyang Fleet, the most prominent of China's naval units in the late Qing Dynasty.  He is best remembered for his actions as commander of the fleet flagship, the "Dingyuan", during the First Sino-Japanese War.  After his death and the ship being destroyed at the end of the war, he was raised to national hero status in modern China.  At his death, Liu was commander of the fleet flagship, with the rank Admiral of the Right, and reserve Admiral of the Fleet. The First Sino-Japanese War (25 July 1894 – 17 April 1895) was fought between the Qing Empire and the Empire of Japan, primarily over influence of Korea.  After more than six months of unbroken successes by Japanese land and naval forces and the loss of the port of Weihaiwei, the Qing government sued for peace in February 1895. Admiral John McClure (13 November 1837 – 18 January 1920) was a Scotsman serving in the Imperial Chinese Navy who, following the suicide of Admirals Ding Ruchang and Liu Buchan, took command of the Beiyang Fleet during the Battle of Weihaiwei and surrendered it to the Japanese. Emperor Wu of (Liu) Song ((劉)宋武帝; 363–422), personal name Liu Yu (劉裕), courtesy name Dexing (德興), nickname Jinu (寄奴), was the founding emperor of the Chinese dynasty Liu Song.  He came from a humble background, but became prominent after leading a rebellion in 404 to overthrow Huan Xuan, who had usurped the Jin throne in 403.  After that point, using a mixture of political and military skills, Liu Yu gradually concentrated power in his own hands while expanding Jin's territory.  In 420, he forced Emperor Gong of Jin to yield the throne to him, thus ending Jin and establishing Song.  He ruled only briefly, for two years, before dying and passing the throne to his son, Emperor Shao of Liu Song. The Qinghai–Tibet War was a conflict that took place during the Sino-Tibetan War.  A rebellion led by the Dalai Lama with British support wanted to expand the original conflict taking place between the Tibetan Army and Liu Wenhui (Sichuan clique) in Xikang, to attack Qinghai, a region northeast of Tibet.  Using a dispute over a monastery in Yushu in Qinghai as an excuse in 1932, the Tibetan army attacked.  Qinghai Muslim Gen. Ma Bufang overran the Tibetan armies and recaptured several counties in Xikang province.  Shiqu, Dege and other counties were seized from the Tibetans.  The war against the Tibetan army was led by the Muslim General Ma Biao.  The Tibetans were pushed back to the other side of the Jinsha river.  The Qinghai army recaptured counties that had been controlled by the Tibetan army since 1919.  The victory on the part of the Qinghai army threatened the supply lines to Tibetan forces in Garze and Xinlong.  As a result, this part of the Tibetan army was forced to withdraw.  Ma and Liu warned Tibetan officials not to dare cross the Jinsha river again.  By August the Tibetans lost so much territory to Liu Wenhui and Ma Bufang's forces that the Dalai Lama telegraphed the British government of India for assistance.  British pressure led China to declare a cease-fire.  Separate truces were signed by Ma and Liu with the Tibetans in 1933, ending the fighting.  The British had backed up the Tibetans during the war.  After their war the victory over the Tibetans was celebrated by Xikang and Qinghai soldiers. Major-General Sir Richard Hannay, KCB, OBE, DSO, Legion of Honour, is a fictional character created by Scottish novelist John Buchan and further made popular by the 1935 Alfred Hitchcock film "The 39 Steps" (and other later film adaptations), very loosely based on Buchan's 1915 novel of the same name.  In his autobiography, "Memory Hold-the-Door", Buchan suggests that the character is based, in part, on Edmund Ironside, from Edinburgh, a spy during the Second Boer War. Alice Comyn, Countess of Buchan, Lady Beaumont (1289 – 3 July 1349) was a Scottish noblewoman, a member of the powerful Comyn family which supported the Balliols, claimants to the disputed Scottish throne against their rivals, the Bruces.  She was the niece of John Comyn, Earl of Buchan, to whom she was also heiress, and after his death the Earldom of Buchan was successfully claimed by her husband Henry de Beaumont, Earl of Buchan, by right of his wife.  His long struggle to claim her Earldom of Buchan was one of the causes of the Second War of Scottish Independence.
Answer: First Sino-Japanese War