First thing: I've given up trying to figure out how to make a fleet.
Second thing: How should I employ carriers exactly? Should I include them in big fleets with battleships, or should I be using them from a long distance while a pure "gun" fleet engages?
I usually crush the IJN in a couple of months with the following composition strategy:
I have three fleet concentrations in the Pacific (and one smaller fleet concentration with no CV in the Atlantic since most of the German and Italian fleet is usually destroyed by the RN by the time the USA joins in):
The fleet concentrations look a bit like this (remember you need at least as many screens (CL + DD in vanilla) as capitol ships in one fleet!):
1. 3x CV + 3x CL commanded by a four star commander with the highest skill available
2. 2xBB + 1xHC + 2x CL + 1x DD commanded by a one star
3. 3x HC + 3x DD commanded by a one star
4. 4x DD commanded by a one star
The amount of screens (CL and DD) added to different fleets is depending on availability. Important to realize is that CL have a better range then DD and you need to be able to respond quickly to any Japanese move anywhere in the Pacific. This is where range comes and the importance of adding CL to your most important ships (CV, BB, BC and HC in that order) as in the ones that can do and take the most damage! So my CTF’s (Carrier Task Force) always have CL and no DD. My second important ship is the BB, so they get as many CL as possible but usually I don’t have enough of them to fully cover my BB fleets. In those cases I pick my most modern DD and add them to those fleets.
I usually have a couple of BB and HC left over and create which makes it possible to create one extra BB and one extra HC fleet for the Pacific. I add one of each to a fleet concentration. So one concentration had two BB fleets and one concentration had two HC fleets. I add them to the fleet concentrations that I expect to face the brunt of the IJN. I also number my fleets with the numbers 1, 2 and 3 (so I know to which concentration they belong). So the three fleets have aprox the following amount of ships:
1. 28 ships
2. 28 ships
3. 22 ships
These numbers are important because the maximum amount a four star can command without a penalty is 32 ships. So there is room to add TP for invasions without getting a penalty since a corps of 4 divisions of 3 regiments can be transported by 4 TP.
Battle: Invade islands with you entire fleet concentration and the IJN will react or wait for the IJN to invade you and attack them will your closest fleet concentration. When you do attack them, make sure your fleets arrive more or less at the same time in the province where they are gonna attack. If you would deploy from let’s say Midway to defend Guam and click on the Guam sea province straight away, parts of your fleet will arrive a lot earlier and get hammered by the IJN!
Carriers can do without micromanagement but are far more effective with micromanagement. Each CV should have one CAG unit consisting of 2 CAG squadrons. Have two, so four squadrons, attack the enemy fleet manually and have one, 3 CV remember, carry out an air superiority mission over your CV. If you have support from land bases INT or FTR use em on air superiority mission to cover your fleet. Land bases aircraft will pretty much destroy enemy CAG units since they are a lot stronger!
Important with CAG’s is to have at least one skilled commander per CV and make him a two or three star because a one star gets a penalty when commanding 6 squadrons! The other CAG’s can have one stars because they wont be in command of any battle. Besides a one star gains experience faster. For my CAG’s I usually have one 3 or 4 skill lvl commander per CTF and the rest of my CAG’s have a level 2 or 1 as commander.
Happy hunting
Last thing: what's the best kind of garrison to put on an island to resist an invasion? I'm not sure if the stacking penalties are the same when it comes to amphibious assaults. I suspect not, because the last time I had only 4 divisions on an island they got torn apart.
The AI generally will not invade a port when defended by two units. Though this works in Europe it’s impossible for both Japan and the USA to defend every island with 2 units since they have less MP than Germany. The best defense of course would be 3xINF but its an expensive solution and still doesn’t guarantee they can actually hold the island in question.
With the USA I always use 3xGAR. They can defend for some time and they usually buy me enough time to get my fleet in to destroy the invading forces before they are destroyed. Coastal fortifications always help in the time you get to respond.As Japan I start off with 3xGAR but switch to 3xMIL before I start the fast expansion of my empire in the Pacific. The good thing about MIL is that they take very little time and IC to build but the bad thing is that 3xMIL is pretty useless when it comes to defense. So I deploy 3xMIL on islands I don’t expect to be attacked by the Allies: Basically the inner ring while the outer ring is defended by 3xGAR.