In a recent game I played as the Allies and let a buddy tackle the Axis. He shortchanged himself by underbuilding at the southern France factory (he was intent on helping Italy with Germany) but only built a cruiser, sub and transport there (and moved the DD over)
The UK attacked this fleet, killing a German DD, CR, TRN and Italian CR and TRN.
He was quite mad, but learned an important lesson. The UK can NOT let the Germans get off cheap and flood Africa with Germans. I had to kill it.
After a few rounds we discussed that he should have bought a carrier or airbase for southern france if he wanted to go that route.
Imagine a purchase such as that as German forces swooping in and taking over the Vichy French navy (not really building ships in the med, but paying to steal ones already there)
The game is still ongoing, but as a warning to Axis players, don’t try and be cheap about helping Italy, or the UK will attack and kill that fleet. (unless you kill that UK Carrier)