30th September – 21st November 1943 – Thailand – Part I - Competing Visions
With the last mopping up operations in the Dutch East Indies completed it was natural for attention of Montgomery to turn to planning the next moves against the Japanese, and the British faced a range of conflicting ideas and objectives that had to be navigated by the politicians and military leaders in South East Asia and in London. One major issue was the reluctance of the Australian government to see its troops deployed for any further offensives. With the trade and supply routes to Australia secure and the threat of Japanese attacks on Australia lifted the argument from Canberra was that Australia had ‘done its part’ and others should take up their fair share of the burden. Part of the reason for this was the somewhat frosty relations between the American forces staging through the country and their Australian counterparts. The Australians had come to see the Americans as ‘arrogant’ and ‘high-handed’, and that their troops had plenty of money to throw around when on leave did nothing to endear them to the local population, at least not the male population. There was also the tendency of the US media to ignore the contributions of their Allies to the ongoing advance across the Pacific [1].
One example that particularly rankled with the Australians, and the British for that matter, was the film ‘Objective Java’ starring Errol Flynn. It was sarcastically suggested that ‘Alone on Java’ would have been a more appropriate title as the film showed only US troops involved, even down to the amphibious assault that marked the relief of Java and the climax of the film. The British government had little choice but to acquiesce to the Australian demands to repatriate their troop, which mean that future operations would be even more dependent on Indian troops, especially given that British reserves were not endless either and had to be focused on Operation Millennium and possible future operations in the Mediterranean and the Aegean, with the Balkans being back on the agenda after the success of Operation Jasper. More Indian troops inevitably meant more pressure to conclude a political settlement for the future of India, which some in London were happy enough to embrace even if Churchill was increasingly uneasy. Not everyone in Australia was happy about this policy either, believing that it was a retrograde step and risked sacrificing Australia’s influence in the empire [2].
The Americans had of course already set their own plans in motion and even if there had been any resources to spare, they were unwilling to release them in support of operations to restore colonial rule on behalf of the British, Dutch, and French. This attitude was only reinforced by the behaviour of the Dutch towards to the freedom fighters who had conducted a guerrilla campaign against the Japanese in the Dutch East Indies, only to be treated as dangerous revolutionaries to be suppressed as the Dutch sought reimpose the old order in their territories. The American position was regarded with deep cynicism among the British and Free French, where it was seen as simply reflecting the US desire to pry open the colonial empires for the benefit of their own commerce and industry. Roosevelt and Churchill did their best to downplay this divergence in views, De Gaulle on the other hand was quite vocal about ‘American imperialism’, which further soured relations with Washington [3].
However much some in Whitehall might have sympathised with De Gaulle’s views in private they were not inclined to embrace his ‘bold’ strategy for the progression of the war in South East Asia. De Gaulle advocated bypassing the Japanese forces in Thailand and launching a new amphibious assault, this one aimed at the coast of Vietnam. The French obsession with liberating their possessions in Indochina had only grown stronger after the victory in the DEI, and the way the British had supported the Greeks in the liberation of Rhodes also rankled. On the British side there were quiet mutterings about French egos and ingratitude. After all, while De Gaulle was pressing for action over Indochina the Allies were preparing for Millennium and even the most cautious former outposts of Vichy had declared for the Free French, almost entirely as a result of the British victories in North Africa and the ensuing collapse of the Vichy regime. The limitation of the available shipping allowed the idea of an invasion of Indochina to be politely dismissed, for the time being at least, and let the British focus on the operation that Auchinleck, Slim and Montgomery had been advocating all along, an invasion of Thailand, specifically a drive up the Malayan peninsula towards Pattani, ultimately aimed at Bangkok, with a parallel advance from Slim’s forward base at Mae Sot towards the Thai capital. Once these two spearheads linked up then a drive along the coast into Indochina would be the next step, but only once the position was secure and the flanks of the British drive were solidly held. What amphibious resources were available would be used to conduct a series of modest landings designed to flank any Japanese defensive lines. This plan would have seemed very familiar to the Japanese, the differences being the direction of the advance and the fact that the British had the resources to make it work [4].
Slim was now commanding what had been designated as I Burma Corps. This retained 10th Indian Division and 1st Cavalry. The latter was in the process of becoming a mechanized division, much to the chagrin of many of its old hands. It did still retain a large part of its horse cavalry, though now supplemented by armoured forces that leant heavily on light and cruiser tanks, with the M3 Stuart being predominant and winning over many of those who had to give up their horses. I Burma had also gained 4th Indian Infantry division and both the 4th and the 10th had acquired motorized transport better suited to the terrain they had to fight through, largely consisting of Universal Carriers that had undergone a significant degree of ‘localization’ at the hands of mechanics who had learned the hard way what it took to keep motorized vehicles running in the Burmese jungle. Slim was also acutely aware that his force was essentially an Indian Corps and he sought to identify and promote Indian officers to more senior roles in the Corps. This was an astute move as it helped to not only bolster the morale of the troops serving under him but helped to address the criticisms being voiced by some of the hard-line elements in the Indian National Congress [5].
Montgomery’s force in Malaya was decidedly more Anglo, with the 36th and 70th British Divisions, and 2nd New Zealand, in theatre now to replace 7th Australian Division. There were Indian divisions operating as part of his force in the shape of the 7th and 8th British Indian Army Infantry Divisions. 3rd Armoured brigade was also part of the forces in Malaya, operating as part of IX Corps alongside the British Divisions while the Indians and New Zealanders were formed up, slightly incongruously, as XXXIII Indian Corps. 3rd Armoured had been strengthened by the arrival of some seventy Valentine tanks attached to provide close support for the infantry in addition to the ubiquitous M3 Stuart and M3 Lee. The British 2nd Infantry Division was retained as an operational reserve alongside a Canadian brigade. Both the forces in Burma and Malaya could now count on extensive air and naval support, with the Royal Navy having almost complete free reign after the defeats inflicted on the IJN and the RAF and RAAF, the latter remaining in the theatre of operations, had received additional squadrons and new aircraft. This meant that the British could expect to have total air superiority during the offensive [6].
The battle plan developed by Montgomery and Slim was approved by London in late July, codenamed Operation Rambler, but it would not be launched until the end of September or the beginning of October depending on the vagaries of the Monsoon season. In the end the date for the beginning of operations in Malaya would be set for the 28th of September. The basic plan was thrusts along the east and west coasts of the peninsula that would ideally squeeze the Japanese forces into a narrower front with the more mountainous terrain of Burma barring any movement further to the west and allowing British spearheads to encircle them. More realistically the expectation was that the attack would force the Japanese to withdraw to the north and soften them up for final breakthrough towards central Thailand and Bangkok [7].
The supply situation of the Japanese forces in Thailand was somewhat better than that of the defenders of the DEI, which was not to say their position was good. Their lines of communication hand not yet been as thoroughly interdicted as those of the troops on Borneo in the first half of 1943, but as the summer wore on the sea routes to the ports along the Thai coast were attracting the attention of an increasing number of Allied submarines operating out of Singapore and harbours such as Pattani were subjected to repeated bombing raids. Attempts by the IJAAF to carry out their own attacks on British targets were far less successful and far more costly as by this time the radar network in Malaya provided effective coverage and was integrated with the fighter control system, meaning that the Japanese had no possibility of surprise and were all but guaranteed to be intercepted. The obvious alternative of bombing by night was attempted by the IJAAF, but they lacked the sophisticated navigation devices being deployed by the combatants in the European theatre of operations and they were achieving an even lower level of accuracy than Bomber Command had managed back in 1940-41, with the added hazard that the RAF had rather better night fighting tactics than Fighter Command of that period in the war, though dedicated night fighters were still a rarity in South East Asia [8].
As far as naval support went there were still Japanese submarines braving the waters around Singapore and Rangoon, but anti-submarine warfare was another area where the British had refined their tactics and technology in the hard battles of the Atlantic. Lacking snorkel devices, the Japanese submarines were highly vulnerable to patrolling aircraft and the doctrine that saw the IJN submarines operating individually and focusing on trying to target warships rather than merchant ships made matters worse. Their very occasional successes were heavily outweighed by the losses taken to achieve them and with the loss of the DEI the Imperial Japanese navy was acutely aware of its perilous fuel situation and began to restrict ‘peripheral’ operations to retain fuel stocks. Although it was not publicly admitted this measure was aimed at ensuring that the IJN could intervene when the Allies inevitably began to attack the inner defence perimeter around the Home Islands [9].
The issues facing the IJAAF and IJN meant that they did little to disrupt the preparations of the British forces and the Japanese forces in Thailand were facing an uphill battle to create a defensive strategy that would stop a British advance out of Malaya or even slow it down. They were acutely aware of the threat of amphibious assaults along the peninsula but finding the men and equipment to prevent such landings was a struggle. Adequately defending the coastline would leave the forces facing any assault out of Malaya dangerously thin, a problem compounded by the likelihood of an attack from the direction of Mae Sot by Slim’s Corps. The only practical solution would be the creation of a mobile reserve designed to counterattack any amphibious assaults. There was the equivalent of a short regiment of Japanese armour available in Thailand and the overall commander had ordered that they be concentrated into a single formation, with priority for the available fuel to ensure that they could act as a reaction force, in theory.
The Japanese tanks of 1943 were the same mix of models as they had been in 1941. Newer designs either existed only as prototypes or had been assigned elsewhere. Still while these tanks were ineffective against any Allied armour, they would encounter in 1943 they were capable of creating havoc for lightly armed infantry coming ashore in an amphibious assault. The real issues the Japanese tanks faced were down to serviceability and the fact that the Allied control of the sea allowed them to conduct landings on either coast of the Malayan peninsula while the road infrastructure would not allow for the swift redeployment of armoured vehicles. The serviceability issue was down to a shortage of spare parts and the mechanic needed to maintain the tanks in less-than-ideal conditions. Where the British, Germans, and Americans had created dedicated organisations to maintain and repair their armoured vehicles the Japanese approach was still an ad hoc affair and because of this at least a third of the tanks in Thailand were inoperable at the time of Operation Rambler, with many of the others having to be essentially abandoned when they broke down because the IJA lacked any means to retrieve them [10].
Given all the problems faced in defending the Malayan Peninsula there was an argument to be made for a strategic withdrawal to a line of defence that could not be flanked, and this was indeed raised, only to be swiftly and harshly rejected as lacking in fighting spirit. For all the bombast the truth was that the senior officers feared that if the British were allowed to seize the peninsula with only a few rear-guard actions to slow them down they might well be able to isolate Bangkok and advance along the coast into Indochina almost unimpeded, which was indeed part of the British plan. There were no solutions available to the Japanese for a successful defence of Thailand other than massive reinforcement and resupply, which were not forthcoming for Thailand, or any other corner of Japan’s increasingly ragged defensive perimeter. The strategy that the Japanese followed was one the Allies were becoming all too familiar with, a stubborn insistence on fighting to inevitable defeat while taking as many Allied soldiers down with them as possible [11].
[1] Relations between the Australians and the Americans were not great OTL, they are worse here.
[2] And this policy will be revisited in due course.
[3] ‘How to Win Friends and Influence People by Charles De Gaulle’ would be a very short book.
[4] It is a version of what the Japanese did in Malaya OTL but reversed and carried out with superior logistics.
[5] Strategy and politics are becoming ever more entangled as the war progresses.
[6] The British forces in SEA may not be getting everything they want, but they are no longer an afterthought when it comes to equipment and supplies.
[7] At this point I am just having to use some historical campaigns as inspiration and invent these operations from scratch.
[8] The Japanese are running out of merchant vessels as well as warships, which is even worse for places like Okinawa and Formosa that it is for Thailand.
[9] No one in Tokyo is quite ready to admit the war is coming to Japan, and some would regard planning for it as defeatist.
[10] So no massive tank battles in SEA I’m afraid.
[11] A policy that is encouraging the Allies to look at alternate means of defeating Japan.