Generally, Sealion is kind of a standard move if Germany wants to attempt it. In some cases, Germany elects not to go for Sealion and goes straight for Barbarossa instead, or occasionally someone will come up with some other inventive strategy.
Anyway, if you want to try a Sealion, usually it goes this way:
G 1 – Purchase an Aircraft Carrier, Destroyer and Submarine.
COMBAT MOVE: Take France, Normandy and Yugoslavia. Use Luftwaffe and Subs to kill as much Royal Navy as possible, especially Sea Zones 110 and 111. You might also sacrifice your Battleship from SZ 113 to save some of your planes.
NCM: Cruiser & Transport from SZ 114 to SZ 112. 1 Infantry from Norway to activate Finland. 1 Infantry from Romania to activate Bulgaria. 11 Infantry & 3 Artillery from Germany to W. Germany. 1 Fighter & 1 Stuka to SZ 112 (to land on new carrier), all other surviving planes land on Holland/Belgium or W Germany, depending on their range.
PLACE: Aircraft Carrier, Destroyer and Submarine in SZ 112.
COLLECT: Between the territories you conquered and plundering the French treasury, you should have about 70 or 71 IPCs for next round.
G 2 – Purchase 10 transports.
COMBAT MOVE: Won’t be much combat. If any Royal Navy survived and you have the chance, finish them off with your surviving Luftwaffe and/or Subs.
NCM: Move any surviving land units from France back to W Germany. Move infantry from Bulgaria to Romania. Split surviving units in Yugoslavia between Romania and Slovakia/Hungary, perhaps a tank or two can go up to Poland.
PLACE: 10 transports in SZ 112.
COLLECT: Should be about 51 IPCs from territories and NOs.
G 3 – Purchase land units to place in Berlin to go to the Eastern Front. Once London falls, Russia can attack so they may do so. If not, then Russia is your next target anyway. If possible, replace some of your Luftwaffe losses from rounds 1 and 2.
COMBAT MOVE: INVASION! Fill all 11 transports in SZ 112 with 11 infantry and all the tanks and artillery you have available. If you run out of tanks or artillery, use any surviving mechs or other infantry. Just make sure that both spots on all 11 transports are full. Move fleet from SZ 112 to SZ 110. Unload transports into England. Fly all possible aircraft to England as well. If the UK did not scramble when you attacked the navy and still has fighters available to scramble now, you should divert a couple of planes to assist your destroyer and cruiser, but the rest can go on to England. Odds are that the UK saw your purchases and bought accordingly, so he will have a big stack of men there, so it will be one hell of a battle. However, Germany should have the edge in firepower if you didn’t lose too many planes taking out the Royal Navy. In most Sealion battles like this, the odds are usually about 65-75% in Germany’s favor.
Of course, there are many things that affect this. If you lost too many planes taking out the Royal Navy, then you won’t have as many to support the invasion. If UK decides NOT to scramble, then any planes you sent to support the fleet are pretty much wasted, although you will get a cruiser support shot for the first round.
You have to remember the pros and cons of a successful Sealion.
PROS: You will get to plunder London’s treasury and Great Britain itself is woth 6 IPCs. Also, taking Britain out will be a big help to your little buddy Italy, who should be able to dominate the Med and Africa in the next 2 or 3 rounds.
CONS: Once London Falls, both Russia and the United States can immediately declare war on the Axis and attack. With all the preperation for Sealion, your Eastern border may be weak which will invite a large Russian attack. The US may very well end up taking London right back in a couple of round and may also screw up plans for your across the world friend Japan.
Anyway, that’s a pretty general plan for Sealion. There are some that plan it for a G 4 attack or even later, but G 3 is kind of the standard if you are set on doing Sealion. Good Luck.