dudalb
Penultimate Amazing
But let's address Bismarck. Hell, let's throw in Tirpitz too. And a completed Graf Zeppelin carrier. Why not? If we're going into fun alternate history scenario, let's dive in with glee like the Stuka.
You'll notice that what Bismarck manage to do was basically lead a small number of warships on a chase around the British Isles, trying to avoid a confrontation it couldn't win. When it was forced to actually stand and fight against just TWO battleships (the heavy cruisers only really joined at the end, after the Bismarck had lost its main guns), because that pesky aircraft disabled its rudder, yeah, it got blown to pieces. Even though by the end Rodney was shooting point blank at its thickest armour.
I'm not sure what even two of them could do against the whole home fleet, much less the combined all fleets in Britain. Which really is what would have been out, if Britain had to do an all out effort to keep off an invasion. They wouldn't have gone, "oh, let's keep our ships in port. We can't afford to lose a few."
Also bear in mind that this time they wouldn't just face a few obsolete carrier planes, but just about every bomber the Brits could put in the air from regular airstrips too.
The Bismarck also had several problems. I'm sure the more history versed folks here know them, but in case someone doesn't, here is a very relevant one: its AA guns couldn't depress below a certain angle, making it all but defenseless to torpedo bombing attacks. Which is how and why a few slow interwar carrier planes torpedoed it in the first place.
And even its armour wasn't as impenetrable as some people think. It wasn't the Yamato. Yeah, it was hard to sink, but it hadn't been all THAT hard to put out of action. A single close range 16" salvo from the Rodney blew upthe forward control post and killed most of the senior officers. A few more salvoes blew up its main turrets. And remember, this wasn't plunging attacks against the thinner roofs. The Rodney was closing as fast as it could and shooting at the thickest side armour.
All in all, the Bismarck was actually disabled pretty quickly when forced to stand and fight. Yes, the battle took a lot more time, but mainly because the Brits were determined to sink it already. For most of the shooting gallery that ensued, the ship was as good as no threat to anybody. It certainly wouldn't be in much of a position to support an invasion or anything.
Now some may object that it WAS only because being forced to stand and fight in close quarters, but really, that's also what you could expect if fighting to support an invasion in the Channel. I mean, sure, it probably could retreat to port and avoid being sunk, but that's back to square one: now the Royal Navy can sink those transports with impunity.
ANy alternative World War 2 naval scenario, I DEMAND we include "Montana" class US Battleships....