Kota Bahru serves as an example of how, in my view, Malaya was lost in London long before Japan attacked.
I think the faults on the British side come down to two things: London (in large part synonymous with Churchill’s ill-conceived opinions and interference in matters military for reasons political) and lack of air power. The second is really just a consequence of the first.
The first requirement was to implement the preparatory plans, devised in Malaya and agreed in London.
This failed because Malaya command was never given the resources to do so. That was London’s fault.
Malaya command was left to prepare for defence on the basis of the agreed plans, while London never bothered to tell it that it had no intention of giving it the necessary resources and that it had better come up with some different ideas, quick smart.
In the agreed plans Malaya command recognised the need for air power, in particular in northern Malaya to cover the likely, and accurately identified, Japanese landing points and subsequent advances.
Malaya command therefore embarked on building airfields at strategic points. As a result of London’s failure to provide resources, these potentially decisive strategic airfields became millstones around Malaya command’s neck… Of the 9 airfields in the north-west at the time the Japanese landed, only 3 had planes; only 2 of the 3 in the north-east had planes; and only 3 of the 7 in the south had planes. Not only were these airfields unable to fulfil their function in the plans, and thus totally useless, but they also needed to be defended to deny them to the enemy, thus dictating tactical dispositions which hampered Malaya command’s ability to respond with an otherwise free hand to the Japanese attack.
The Chiefs of Staff considered Malaya command needed 336 planes to defend Malaya, while Malaya command said 582 at its latest pre-invasion estimate. London gave it 13 squadrons totalling 158 aircraft, less than half of what London thought it needed. The aircraft it had, and certainly the fighters, were woefully inferior to the Japanese planes. What aeroplanes were in Malaya were doomed before they took off, but take off and fight gallantly they did.
The consequences of these failings were that Malaya command lacked the capacity to repulse the Japanese landings with air power. If we contrast the great effect of the fighters at Milne Bay which flew air support for ground troops and damaged troop landing and supply barges with the mpact of the bombers at Kota Bahru, which had to withdraw fairly quickly as the airfield was in early danger of being taken by the Japanese, it is likely that even two or three squadrons of top line British fighters with good pilots in ground support roles could have tipped the scales at Kota Bahru. The Indian troops at Kota Bahru fought bravely and effectively at the landing point, to the extent that Col Tsuji said it was the most costly fighting in the Malayan campaign. With air support it might have been a lot more costly, perhaps to the point of victory.
The IJN escort at Kota Bahru wanted to leave fairly early in the piece because of the damage they were suffering from air attacks. The IJA commander persuaded them to stay, because he wanted support for his advancing troops on the ground. Had his troops been subjected to solid air attack he might have had a different opinion.
Another consequence of the lack of planes was the loss of the Repulse and Prince of Wales. In part this was due to Admiral Phillips’ radio silence and failure to call for air support in the latter part of the disaster, but in the early part he was informed that air support would not be forthcoming as he moved towards Singora. Had the British held Kota Bahru and had they had decent air forces stationed there, consistent with its strategic and tactical importance, Phillips would have steamed on to Singora. Or he could have backed up at Kota Bahru, where the Prince of Wales, Repulse, and the three remaining RN / RAN destroyers would have faced an IJN heavy cruiser, light cruiser, and four destroyers. The IJN commander at Kota, already worried about the risk of damage from the air with the meagre forces actually used, might then have withdrawn. At the very least, he would have had to fight and head for sea room to do it, which then deprived the landing forces and transports of naval support, leaving them easy prey for air forces. Phillip’s force might have destroyed or dispersed the Kota naval force, and even got in among the landing force with devastating results. One or two British destroyers against troop transports would be enough.
Or maybe Japan would have diverted sufficient air forces to neutralise or defeat the air power at Kota and sunk the British naval force there instead of further south. Who knows?
Whatever might have happened, the Kota example illustrates how improved air force could have altered dramatically what actually did happen. As the first battle of Wake Island, and Coral Sea on a much larger scale, showed it was possible to repulse a Japanese landing force if its naval force could be sufficiently mauled before landing, and as Milne Bay showed it was also possible to repulse it after landing with ground troops with adequate air support.
http://www.ww2incolor.com/forum/showthread.php?t=4781&page=2