**I need solid game rules only, not house rules. Im trying to figure the game out on how its suppose to be played.**

1 - Its a long question sorry, but here it is broken down. I know you cant retreat in an amphibious battle, but Im seeing online that you have to fight to the death? I need clarification on this. 
   
   So when an amphibious assault happens, does the attacker fight to the death? Even if the battle ends with both sides taking one casualty? or does the attacking force fall back to the transport from once it came and the defender stays put?

2 - In a attacking land battle. Can the defender choose to retreat to an adjacent friendly/unoccupied territory? or does the attacker only have the ability to retreat in the middle of the battle after seeing to many casualties happening? OR is it not possibly period and only planes and submarines have the ability to retreat. 

Thank you for your time in advance!