I’ll respond to your arguments one at a time because I feel like I did not make some of my points clear enough in my initial post.
@Argothair:
DoManMacgee, I think there’s a real possibility that a British fleet near Singapore would simply have been sunk by Japanese aircraft, much the same way that the HMIS Prince of Wales and the Italian fleet at Taranto went down.
I neglected to note that the lack of a war in Europe would free Britain to move some elements of the RAF and land reinforcements to Asia as well. Assuming UK made peace with Germany shortly after the fall of France, they would have over a year to work out the logistics on this and presumably no U-Boat threat, so I’m certain they’d be able to reinforce Singapore by time Japan made their way down there.
@Argothair:
Until the great powers learned the importance of providing air cover for their fleets, it doesn’t much matter how many battleships you send to guard a port; the battleships just become so much scrap. Besides, most of the invasion of Singapore was overland, using troops carried by bicycle along the Malayan peninsula.
You neglected to mention that the Japanese invasion of Malaysia was accomplished via amphibious landings in Thailand, which gave their attack a greater surprise factor and speed (Thailand surrendered to Japan in 5 hours). A stronger Royal Navy may have allowed UK to intervene on Thailand’s side in the event of the Japanese invasion, which may have bolstered the Thai will to fight. A long, drawn out Thailand campaign would probably devolve into a stalemate with moderate gains for Japan a la Burma.
You also neglected to mention that the UK’s Fighter Squadrons were miserably outclassed and obsolete, in addition to being outnumbered almost 2:1 by the Japanese Air Force. Again, I apologize for not mentioning the possibility of an increased RAF presence in British Asia as a possibility in addition to the presence of the Royal Navy, but my point is that throw a couple Spitfire Squadrons in Singapore and suddenly the fight becomes a lot less one-sided.
@Argothair:
Possibly the Japanese would have diverted enough of their carriers from Pearl Harbor to Singapore that the Pearl Harbor attacks would have been delayed, weakened, or cancelled. I’m not sure how that shakes out in practice – the US starts the war with another 4 battleships, which are marginally useful, but maybe they’re slow to learn the importance of building carriers, and they lay down a bunch of battleship hulls instead of carrier hulls, putting them at a disadvantage in 1943.
I don’t buy this explanation. The USN already at least somewhat grasped the importance of Aircraft Carriers, as they had already laid down the hulls for Lexington, Yorktown and Saratoga in the 30s. Just to give a few examples.
@Argothair:
If the battleships get sunk by the Japanese air force in 1942, then Japan might wind up doing better than its historical par, not worse. I still don’t think it’s enough for Japan to come anywhere close to winning, but it might be enough to put a real crimp in the US’s willingness to ship supplies to Kamchatka.
If Japan winds up able to successfully maintain a naval base in the western Aleutian islands and park a carrier there, for example, then I don’t see much Lend-Lease getting through to Russia. Kamchatka was in many ways a less convenient port than Archangel or Basra for shipping Russian aid. If Britain is technically out of the war, does Persia still wind up getting used as a lend-lease conduit? Maybe Russia takes over all of Persia, with British acquiescence?
If there was no Pearl Harbor attack and the IJN had to use a large portion of its navy to sink the UK Fleet off Singapore (something I argued would probably not happen but I’m assuming your scenario here), I can’t imagine that they’d also be able to swing that navy back to the Northern Pacific, destroy the USN at a Midway-esque battle with a larger disparity in force than they had historically and broken codes, and then proceed to take and hold the Aleutians.
Additionally, the US was able to ship Lend-Lease to the Soviets because Japan and the USSR were neutral and the Japanese feared provoking a Soviet invasion of Manchuria. Unless they USN was completely and totally eliminated I doubt Japan would have made any real effort to interrupt the flow of supplies to Russia.