Amphibious Annoyance

[5cats]

It bugs me that you can invade (amphibious or parachute) have combat and then run away!
I can easily see it if you invade a vacent province, but NOT if there are defenders and you engage in combat.
Why aren't the invaders required to stay and face the counter-attack they so richly deserve? Insted they hit & run, getting off almost scott-free! Can't recall this ever happening during the war.

Also, why aren't the two main Japanese provinces Fortresses? Their defences were incredable! Dispite the bombing & everything the US was looking at 500,000 casualties just taking the southern island. (dead & wounded over about 2-3 weeks) 1000 Kamikazi aircraft ready to go, hidden & undetected pillboxes, suicide frogmen, civilian human waves... (shudders)