A tonne of stuff to deal with. Especially the Pacific. ASBs up there, here they come.
Meeting with Darlan before torch landings convinces him to join having French navy sail from toulon and immediately join the allies. French army fight german and Italians in Tunis airport and hold. Allies land follow in forces in bizerrte and Tunis and move rapidly on Tripoli. North Africa secure by end january 1943. Italian military seeing the writing on the wall and with the blessing of the king actually plan their double cross after Tunis falls. Contact allies and tell them they wish to switch sides. This prevents unconditional surrender proclamation at Casablanca conference. Plan is set to go off when it appears allies are ready for next move. In june of 1943 They take Mussolini in a night [raid] and and using surprise and superior numbers to make up for equipment and training cripple german forces in Italy and Greece. The soldiers and officers motivated by the promise of an Italy not punished by the allies and the kings personal plea to spare the destruction that would come if Italy is a full battleground. Allied forces preparing for the invasion of sicily sail instead to northern Italian ports, and to greek ports to reinforce the Italians before the German can put together an intervention force. This allows allowed fighter cover over all of Germany rapidly decreasing the industrial and transportation network. Places ploesti refineries under air assault with escorts. Allies on the continent in force and in defensible positions with ever increasing force and air support make german officer also see writing on the wall and plan coup of their own. Christmas 1943 overthrow Hitler and make deal with allied powers. Stalin protests but not in a military situation to force the issue. War ends with russia back to it's original borders.
The problems (^^^) are material and technical.
a. The US Army is not good enough, and neither is the USAAF to make this scenario remotely possible. (This will happen a lot in the following comments)
b. The Italians are not strong enough unless ASBs come down and give them miracle operational art skills and material to carry their share of the load.
c. The sea lift is not simply not there, so even if the British are 30% more efficient and there 2x as many of them trained and ready to go in the ATL they are not going to be enough of them.
d. Stalin dying might actually speed the Russians' recovery up. He was THAT incompetent. My opinion, ymmv.
Note that this also includes Soviet gains in Asia, like Korea and Manchuria.
This I will deal with in a bit.
I think that Barbarossa would be delayed long enough to deal with the British threat and a large deal of the Commonwealth's offensive potential is wasted in Greece/Bulgaria. However, the Brits weaken/delay the Germans enough that either 1) Barbarossa is launched too late in '41 to punch as deep into the Motherland as it did thanks to rasputitsa or 2) delayed until '42 when the Soviets are more prepared for it.
Either way, this likely results in the Iron Curtain falling further west than IOTL.
e. Not enough sea lift to sustain a Balkans campaign at that time.
Yet another....
Allied leaders determine in 1942 for a soonest invasion of NW Europe. Preparatory operations and diversions are started vs Scandinavia, French North Africa, Corsica, Crete, ect... To provide trans Atlantic cargo shipping & amphibious lift, air power & general y supply other major operations are curtailed. The two largest would be a increase of LL to he USSR during 1943, & telling MacArthur no S Pacific offensive in 1943. Postponing increases in logistics support to China. Setting aside the Aleutians offensive for another year. In other words every major increase in logistical effort of OTL for 1943 is postponed in favor of focusing the difference on NW Europe.
This has two effects: 1. it can draw German efforts off to seemingly successful peripheral areas, like Africa. the Arctic or Scandinavian front, and more offensive in the USSR. 2. The Red Army is less offensive capable & while it defeats the German offensives, it does not gain much ground either.
As the West Allied Armies grind across western Europe 1943-45 the Red Army moves at a much slower pace than OTL. Without US tanks, Studebaker trucks, Baldwin locomotives Bombardier rail wagons, ect... ect... ect... the Red Army is not much past Minsk when US operation ECLIPSE takes Berlin & the motorized Polish Army races off to Warsaw. Similarly Allied expeditionary Corps have been sent off to Prague, Budapest, Bucharest, Sofia, ect... to supervise the clean up of German forces in those nations. The Red Army reaches a western boundary somewhere between its January and December 1939 borders.
f. I think the opposite happens. Even if SWPOA is postponed and those LSTs head for Europe, the chief lifter, the United States, deposits an army in France and Marshall and Eisenhower have to explain why three quarters of a million Americans are behind German barbed wire. The Americans need combat experience AND LESSONS LEARNED. North Africa and Sicily is barely enough as Salerno demonstrates. Sledgehammer would be a disaster.
g. As has been pointed out elsewhere, up until around Kursk LL was not that critical to Russian operations. In 1944, it becomes critical as the Russians now increase their lunge forward capacity and tactical speed from ~ 100 km at 5 m/s to about 450 km and 10 m/s on the ground. This means the Wehrmacht no longer enjoys the 1 or 2 days reaction time they had to see how the Russian attack develops. Now they only have hours, maybe as little as a quarter day to recover from the OODA loop deficiency.
h0. The Pacific.
To keep the Russians out of Manchuria and by extension, Korea, the US has to choose in a hurry between Mao and Chiang. Only China can save China. Mao was a better tactician and a better op-artist, but that leaves the politics and the logistics. Burma is not happening EVER. The terrain and weather is just too tough for anything but air lift logistics in country and that is not available until 1944. With that understood, the only game is ORANGE and that takes a few miracles.
h1. A US submarine campaign on 8 December 1941 that immediately is as effective as the Murder Year of 1944.
h2. MacArthur stays on the Rock.
h3. ABDA puts in a sterling performance that throws the Japanese timetable off by three months.
h4. Coral Sea and Midway wipe out First Air Fleet totally with the loss of every last veteran Japanese aviator and air staff officer and air division maintenance crewman embarked.
h5. Yamamoto dies at Midway (via suicide preferably) to completely rattle IJN morale down to the keels.
h6. Brereton, Brett, English, Withers, Miles Browning, Marc Mitscher, John Tower, Leahy, Pye etc. all are sacked immediately.
h7. Curtin and Blamey have a meeting of the minds. Ditto Crace, or replace that man with Crutchley soonest.
h8. Watchtower kicks off 1 month sooner and catches the Japanese unprepared.
Barring all this, if somebody makes a stand at Rabaul and succeeds to hold the place, then that speeds the Pacific War up by a half year. That in turn puts America at Japan's throat around September 1944. She falls MARCH 1945 instead of September 1945 and when Stalin makes his August move he gets a couple of atomic bombs in the face. That is about the only way to keep Stalin out of Manchuria.