If my fighter attacks a ground territory and wins can it land there or does it have to fly back to a territory that I controlled from the beginning of the turn?
Sometimes you only have one unit to move to somewhere else SSG Rock.
If you have 10 ARM and want to transport them all on the same turn you will require 10 transports. You may load those 10 TRN with 10 INF as well but as mentioned you are not required to do so.
If you guys are assuming that a round is roughly three months than almost any unit could be built in real time in that period of time. I have a book on Panzer Tanks and even the most powerful tank could field a full battalion in a little over three months. And when talking battleships, if it was a German pocket Battleship I believe it could be made in three months. You have to remember that most industries in these countries were geared almost completely to the war effort. :D :D
The German subs cannot submerge before combat has begun. The subs must endure one round of attack and then those that remain have to option of defending or submerging.