Pardon my ignorance, but how is this oil from Saudi Arabia thing supposed to work? There's no rail link, so to trace to the oil, you're going to need a convoy in the Persian Gulf, Arabian Sea, Bay of Bengal, and probably the South China sea. 4 CP for an oil isn't great, but a convoy only has a range of 3, and Siam's ports all face the wrong way. So to get anything out there, you need to either
A) Declare war on the CW and seize a port, most likely Singapore.
B) Wait for France to get Vichied, and then absorb both Indochina and Madagascar, for a 12 and 15 USE respectively.
I simply don't see how it's possible to get Saudi oil in 39, and even if you could, it's going to be very hard to keep secure once the CW does enter the war and starts raiding your guys in the Indian ocean. And even if you can, it's a lot of effort to go through for a single point of oil. Why not work out how to grab Rangoon and the oil in Burma instead? That seems like a much better investment of energy.
To capture the Saudi Oil:
- Sail cruisers with divisions (the MAR and both INF divisions) on them with a convoy point into the Arabian Sea.
- Return to base to Mogadishu (Italian East Africa).
- Next turn, set up the convoy route (using the convoy point out of East Africa to go to the Persian Gulf) and invade with the divisions and MAR from the cruisers in Saudi Arabia. Make sure you got a TRS with an HQ sitting in the Gulf too, to prevent the Saudi's from setting up the CAV in the oil hex (if they do, land the HQ in the hex you've invaded and you can walk to the oil hex, killing the Saudi CAV).
Now, here are the downsides of this...
First: if the Saudi's set up the CAV in Riyadh, you can forget about conquering the country. Only if you put 2 HQ's in the country, you can get supply to be able to kill the Saudi's (lesson for everyone: always put the CAV in Riyadh).
Second: you need a corps on the oil to keep it save. If it leaves, the Saudi CAV can simply run across the desert and grab it back.
Third: US entry. You need to roll for the DoW and a smart CW player will try to get four corps in the country to roll again...
Fourth: as soon as war with the CW starts, the convoy line will have to be removed, which might telegraph your intentions to the CW.
So it can be done, only it doesn't sound advisable to me...
It is also possible with EHQS and/or a supply unit (basically exactly the case why they where introduced). Besides Italy usually has stakes on Saudi-Arabia first.. And they start with an HQ+SU in their NE-Africa possessions.
“WiF is like sex: sure, it may give some practical results, but that's not why we do it.”
- Richard P. Feynman, 'WiF, Sex, and the Dual Slit Experiment'.