Thailand in World War II
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Thailand in World War II officially adopted a position of neutrality until it was invaded by Japan in December 1941. At the start of the Pacific War, the Japanese Empire pressured the Thai government to allow the passage of Japanese troops to invade British-held Malaya and Burma. The Thai government under Plaek Phibunsongkhram (known simply as Phibun) considered it preferable to co-operate with the Japanese rather than fight them. Axis-aligned Thailand declared war on the United States and Britain and annexed territories in neighbouring countries, expanding to the north, south, and east, gaining a border with China near Kengtung.
Thailand retained control of its armed forces and internal affairs. The Japanese policy on Thailand differed from their relationship with the puppet state of Manchukuo. Japan intended bilateral relationships similar to those between Nazi Germany and Finland, Bulgaria, and Romania. Ultimately, the primary aim was to ensure Thailand's neutrality and establish a neutral nation that would be regarded as an equal by the Allies.dubious 
Meanwhile the Thai government had split into two factions, the Phibun regime and a well-organised, pro-Allied resistance movement that eventually numbered around 90,000 Thai guerrillas, supported by government officials allied to the regent Pridi Phanomyong. The movement was active from 1942, resisting the Phibun regime and the Japanese. The partisans provided espionage services to the Allies, performed some sabotage activities, and helped engineer Phibun's downfall in 1944. After the war, Thailand received little punishment for its wartime role under Phibun.
At the start of World War II, Thailand was ruled by an authoritarian government dominated by a group of civil servants and military officers. Its prime minister was Plaek Phibunsongkhram, an army officer who shared many of his countrymen's admiration of fascism and the rapid pace of national development it seemed to afford. Consequently, Phibun cultivated and intensified militarism and nationalism while simultaneously building a cult of personality using modern propaganda techniques.
The regime also revived irredentist claims, stirring up anti-French sentiment and supporting restoration of former Thai territories in Cambodia and Laos. Seeking support against France, Phibun cultivated closer relations with Japan. Faced with American opposition and British hesitancy, Thailand looked to Japan for help in the confrontation with French Indochina. Although the Thais were united in their demand for the return of the lost provinces, Phibun's enthusiasm for the Japanese was markedly greater than that of Pridi Phanomyong, and many old conservatives as well viewed the course of the prime minister's foreign policy with misgivings.
Sporadic fighting between Thai and French forces broke out along Thailand's eastern frontier in October 1940, and culminated in an invasion of Laos and Cambodia in January 1941. The Thai armies were successful in occupying the disputed territories, with the French scoring their only notable victory at sea at the Battle of Ko Chang.
Japan used its influence with the Vichy France to obtain concessions for Thailand. As a result, France agreed in March 1941 to cede 54,000 square kilometres of Laotian territory west of the Mekong and most of the Cambodian province of Battambang to Thailand, which reinstated the original name of Phra Tabong Province. The recovery of this lost territory and the regime's apparent victory over a European colonial power greatly enhanced Phibun's reputation.
Because Japan wanted to maintain both her working relationship with Vichy and the status quo, the Thais were forced to accept only a quarter of the territory that they had lost to the French, in addition to having to pay six million piastres as a concession to the French. Relations between Japan and Thailand subsequently cooled as a disappointed Phibun switched to courting the British and Americans in the hopes of warding off what he saw as an imminent Japanese invasion.
After the Franco-Thai War, the Thai government adopted a policy of neutrality. It was sponsored by Pridi Banomyong, who produced a Thai historical drama film, The King of the White Elephant. The film carried a propaganda message from anti-war interests in Thailand: Thailand should remain neutral, only going to war to defend its sovereignty against foreign invaders.
On 8 December 1941 Japan invaded Thailand. After several hours of fighting between Thai and Japanese troops, Thailand acceded to Japanese demands for passage through the country for Japanese forces invading Burma and Malaya. Phibun assured the country that the Japanese action was pre-arranged with a sympathetic Thai government.
On 21 December 1941, a mutual offensive-defensive alliance pact between the two countries was signed. The agreement, revised on 30 December, gave the Japanese full access to Thai weaponry and to Thai railways, roads, airfields, naval bases, warehouses, communications systems, and barracks. To promote greater military and economic co-operation, Pridi was removed from the cabinet and offered a seat on the politically impotent Regency Council of the absent king, which he subsequently accepted.
The Thai government declared war on Britain and the United States on 25 January 1942. The Japanese invited Thailand to sign the treaty alongside the Axis Powers unofficially with Manchukuo and Wang Jingwei's Reorganized National Government of China. The Thais, alarmed that a long, total war would lead to long term economic problems, initially resisted, but ultimately agreed. Thai resentment on this issue lasted throughout the war, however, and resulted in Phibun refusing to attend the following year's Greater East Asia Conference.
Thailand was rewarded for Phibun's close co-operation with Japan during the early years of war with the return of further territory that had once been under Bangkok's control, namely the four northernmost Malay states after the Malayan Campaign. In addition, the Thai Phayap Army was permitted to invade the part of the Shan States and Karenni States of Burma that was annexed as Saharat Thai Doem. Japan meanwhile stationed 150,000 troops on Thai soil and built the infamous Death Railway through Thailand using Asian labourers and Allied prisoners of war.
Although the majority of Thais were initially "intoxicated" with Japan's string of brilliant victories in early-1942, by the end of the year there was widespread resentment as a result of arrogant Japanese behaviour and war-induced privation. Even during the early stages of the war there was friction over issues such as the confiscation of Allied property and economic and monetary matters, as well as the treatment of Thailand's ethnic Chinese community.
A vicious contest for saw mills and teak forests owned by British companies erupted early on, followed by similar disputes over the control of enemy energy and shipping facilities within the country. Other problems were more severe. For a time Germany continued actively purchasing Thai products, but once shipping difficulties became intractable, Japan became Thailand's sole significant trading partner. Similarly, Thailand had to rely on the Japanese for consumer goods previously imported from Europe and the United States, which Japan was increasingly unable to provide as the war wore on. A shortage of commodities quickly developed, with inflation soaring and standards of living dropping. Worse still, the Japanese had aggressively claimed the right to import goods duty-free, significantly reducing Thai government revenues.
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The following territories of Burma, Laos, Cambodia and Malaysia were annexed by Thailand during World War II. The Thai army would remain in the annexed territories until the end of the war.
- Saharat Thai Doem (Burma), including Mueang Phan District. It did not include, however, the two districts of Möngmaü and Mehsakun of Mawkmai of the southern Shan States, nor part of Kantarawadi in the Karenni States, all east of the Salween River, which although claimed by Thailand, were assigned by the Japanese to their client State of Burma in September 1943.
- Sirat Malai (Malaysia), including Saiburi (Kedah State).
- Lan Chang Province (Laos)
- Nakhon Champassak Province (Laos and Cambodia)
- Phra Tabong Province (Cambodia)
- Phibunsongkhram Province (Cambodia)
Following the fall of the Phibun government in August 1944, the new government of Khuang Aphaiwong communicated to the British government that it renounced all claims to the Shan states and northern Malaya, and that it would immediately return the territories to Britain. The Churchill government did not accept the Thai overture, and was prepared to retaliate. The Thai army evacuated the two Shan states only in August 1945.
Thailand was still allied with Japan when the war ended, but the United States proposed a solution. In 1946 Thailand agreed to hand back the territories occupied during Japanese presence in the country as the price for admission to the United Nations, consequently all wartime claims against Siam were dropped and the country received a substantial package of US aid. Following this event all the Thai-occupied territories returned to their pre-war status and became again part of the states from which they had been annexed.
In December 1942 an armed confrontation between Japanese troops and Thai villagers and police escalated into a shoot-out in Ratchaburi. Although the Ban Pong incident was promptly and peacefully resolved, it served as "a warning signal that alerted Tokyo to the seriousness of the problems in Thailand". This led to General Aketo Nakamura being sent to command the newly formed Thailand Garrison Army. Nakamura's ability to understand the Thai perspective, combined with his affable personality, significantly helped to improve Thai-Japanese relations.
This more conciliatory stance occurred at a moment when the tide began to turn against Japan, something which many within the Thai government recognised. Realising that the Allies had seized the initiative in the war, Phibun, well aware of his predicament, distanced himself from the Japanese. In January 1943 he had two of the Phayap Army's divisional commanders arrange the return of a group of Chinese prisoners-of-war as a gesture of friendship designed to open secret negotiations with Chongqing.
But the prime minister's star was waning at a much faster rate than he had thought. With the Allies intensifying their bombing raids on Bangkok, public confidence in Phibun, already tested by his idiosyncratic domestic policies, was waning fast. His frequent absence from Bangkok led morale to plummet, while a sudden proclamation that the capital and its inhabitants immediately be moved north to malaria-infested Phetchabun was greeted with near-universal bemusement and discontent. The kingdom's ruling elite was becoming increasingly weary of Phibun, whose intimidation and demotion of dissenters within the government served to further unite his opponents, who were gathering around Pridi.
Even the Japanese were becoming disaffected with Phibun. The possibility that a military scheme lay behind Phibun's attempt to relocate the seat of government was not lost on the Japanese. Remote, with the nearest rail connection at Phitsanulok, a half-day's drive away, Phetchabun's main asset was its suitability as a mountainous fortress. Moreover, the site was in an area where the majority of the Thai army was based.
Coinciding with Phibun's efforts to distance himself from the Japanese, the Allied Invasion of Italy and the downfall of Benito Mussolini sent shock waves through the Thai government, and an emergency cabinet meeting was convened to discuss the European situation. Analogies with Italy were soon being made. "Badoglio" became an increasingly popular Thai political epithet, and the Japanese envoy in Berlin was advised by Reichsmarschall Göring to keep a close watch on Thailand, lest it turn into an "Oriental Italy."
Despite the increasing domestic discontent and Japanese distrust, Phibun's political demise would not come until the following year.
Although the Thai ambassador in London had delivered Phibun's declaration of war to the British government, the Thai ambassador in Washington DC, Seni Pramoj, had refused to do so. Accordingly, the United States did not declare war on Thailand. With American assistance, Seni, a conservative aristocrat with well established anti-Japanese credentials, organised the Free Thai Movement in the United States, recruiting Thai students to work with the United States Office of Strategic Services (OSS). Seni was able to achieve this because the State Department decided to act as if Seni continued to represent Thailand, enabling him to draw on Thai assets frozen by the United States.
Despite the reciprocal British declaration of war, a parallel resistance movement was formed by the Thais living in Britain. They were organised by two leading students, Snoh Tambuyen and Puey Ungphakorn, and were assisted by members of the self-exiled royal family, including Queen Ramphaiphanni, widow of King Prajadhipok, and her brother, Prince Suphasawatwongsanit Sawatdiwat.
Pridi, the regent, from his office at Thammasat University, ran a clandestine movement that, by the end of the war, had, with Allied aid, armed more than 50,000 Thais to resist the Phibun government and the Japanese. In 1944 he managed to engineer the unseating of Phibun, who was replaced by Khuang Aphaiwong, the civilian son of a minor nobleman and linked politically with conservatives like Seni. Khuang's main task was to continue the charade of collaboration whilst shielding the growing underground movement. He succeeded in this to a great extent, convincing not only Nakamura, but also the notorious Masanobu Tsuji.
By the beginning of 1945, preparations were actively being pursued for a rising against the Japanese. Plans for an uprising relied on the success of a quick, surprise strike by a special police unit against the Japanese command structure. The residences of leading officers and the Japanese communications facilities were kept under surveillance. The police assault was to be coordinated with a general attack by the partly mechanised Thai 1st Army against Japanese troops in Bangkok. Fortifications, in the guise of air raid shelters, had been dug at key crossroads, and additional troops had been brought into the city in small groups in civilian clothing. The task of Free Thai forces elsewhere would be to thwart Japanese efforts to reinforce their Bangkok garrison by cutting communications lines and seizing airfields.
Pridi had to take into consideration that the Japanese were building up their forces in Thailand, which was likely to become a battlefront in the near future. Previously most Japanese soldiers stationed in Thailand had been support troops, but in December 1944 the local command had been upgraded from garrison status to a field army. The Japanese were gathering supplies and constructing fortifications for a last-ditch defensive effort at Nakhon Nayok, about 100 kilometres northeast of Bangkok.
The atomic bombings and subsequent Japanese surrender precluded the uprising, however. Pridi immediately issued a declaration stating that Phibun's 1942 declaration of war was unconstitutional and legally void, thereby dispensing any need for Thailand to surrender. The Thai armed forces initially attempted to disarm the Japanese garrison, but Nakamura refused, arguing that the matter was for the Allies to decide. Khuang in the meanwhile resigned, citing his previous association with the Japanese as a possible obstacle to Thailand's rapprochement with the Allies. A caretaker premier was found in the person of Tawee Boonyaket, a Pridi loyalist.
In early September the leading elements of Major-General Geoffrey Charles Evans's Indian 7th Infantry Division landed, accompanied by Edwina Mountbatten. Later that month Seni returned from Washington to succeed Tawee as prime minister. It was the first time in over a decade that the government was controlled by civilians. But the ensuing factional scramble for power in late 1945 created political divisions in the ranks of the civilian leaders that destroyed their potential for making a common stand against the resurgent political force of the military in the post-war years.
Moreover, the post-war accommodations with the Allies weakened the civilian government. As a result of the contributions made to the Allied war efforts by the Free Thai Movement, the United States refrained from dealing with Thailand as an enemy country in post-war peace negotiations. Before signing a peace treaty, however, Britain demanded war reparations in the form of rice shipments to Malaya. An Anglo-Thai Peace Treaty was signed on 1 January 1946, and an Australian–Thai Peace Treaty on 3 April. France refused to permit admission of Thailand to the United Nations until Indochinese territories annexed during the war were returned. The Soviet Union insisted on the repeal of anti-communist legislation.
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