Destroyer able to blockade two land territories from one sea zone?

@wwestpro:

But planes can still take them out if the defender is scrambling.

That’s true.  The defender could still have planes left (either carrier-based or scrambled), which would also stop the amphibious assault.

@wwestpro:

@Zhukov44:

I’m unclear whether a successful Sea Lion (G1-G3) changes the political situation.

Does the fall of London bring USA and/or USSR into the war or do they still have to wait till USA3/R4?

pretty sure OOB rules are No, they wait like normal in the instance of an attack.�  But Alpha 3 states this:

“If the United States has war declared on it by an Axis power, an Axis power captures London or any territory in North America, or Japan makes an unprovoked declaration of war on the UK or ANZAC, the United States may declare war on any or all Axis powers.”

Um….you’re quoting Global rules. (1st hint tipping you off should have been the mention of Japan & ANZAC…no Japan or ANZAC in Europe 1940)

So to answer the OP question. No, it does not bring USA into the war when London falls. OOB rules are pretty clear on that one (See page 19 -21)

gilitrbar is a cruical aspect for the allies and a great place to house ships and planes

You are.  The influence of one unit on another disappears beginning in the round after it is no longer in the battle.

if the brits have a ship in sz 119, (the one left of Scotland) by T2 you can plug the canal at 112 T3 and hold up sea lion til T4 giving the US time to counter

No.  The transport must be accompanied for its entire move in order to be “escorted”.

It’s the French connection 8-)

@xzorn:

Having a fleet, planes and a few trannies in the Baltic lets you threaten Britain and Russia, while defending your Scandinavian holdings. Brits will have to be wary of an attack and waste precious resources in anticipation. And if he does, simply use the fleet, airforce and trannies on other things.

So just the threat of Sea Lion is good enough.