@taamvan:
They are referring to a “hit and run” attack, the same way you attack Yugoslavia.
In short, Germany does not want to trade planes with the UK once all non-destroyer ships in range have been sunk.
So, depending if the UK scrambles or not, you may have an opportunity to sink the three ships AND retreat the BB back to where you intend to place your CV, DD, SS and NCM in your CR and CV. This would put a SS, DD, CV, CR, BB, 2 FTR in SZ 112 and up to three more FTR/TAC scrambling over them.
The UK would be ill served to attack this with just aircraft or maybe a destroyer as fodder for multiple rounds of purchases. It also forces the UK to place ships in Canada due to the immediate threat and proximity of the German Navy.
To achieve this, you need the following to occur:
Score at a minimum 4 total hits (2 on BB, 1 on each CR) in the first round of throwing dice on your attack - a second round of combat could feasibly eliminate everything that remains.
Defender does not elect to save the BB by trading out FTR as losses.
Defending ships cannot score more than 2 hits - you take both SS as casualties.
Scrambled aircraft do not score more than 1 hit - you absorb that hit with your BB.
You could feasibly trade a FTR to save the BB for a retreat if the defender scores more hits - and it may be worthwhile to trade a FTR to save a BB for Germany - trading a 10 IPC unit to preserve a 20 IPC Naval unit is a logical and plausible consideration. This is debatable, but in my mind a FTR isn’t very useful after maybe G2 or G3 (ARM will pump up your TAC in Russia anyways). So you do have some wiggle room here in determining casualties.
A scenario like this would mean that all three defending ships are sunk and only scrambled FTR remain. As the attacker you have the option after both sides have rolled dice and removed their casualties to retreat before rolling dice again. This would be the time to retreat the BB to SZ 112, which will repair at the beginning if your next turn.
This opportunistic move will make your fleet dangerous wherever it goes with no Allied naval strength remaining in the Atlantic. Especially if you combine SB/SS purchases after G3 that can threaten naval fleets in a suicide mission to sink a flotilla of ships sitting off of Gib late in the game.
The added bonus is that SB can typically get back into the Russian theater quickly, so they act as a spearhead on two fronts for multiple turns - deterring the placement of an allied fleet off the UK or off of Gib while constantly being in striking range of a Russian stack that decided to make a stand against the German advance.