it's time for a tutorial on the different supply modes in the game...
there are 3 variations of supply rules that can be selected when starting a game of GGWAW
1. Simple Supply - Supply needs to be produced, but it is magically consumed by any unit that needs supply anywhere on the map.
2. Advanced Supply + Auto Supply - Supply needs to be produced but there must be an unbroken chain of Transports (at sea) and Rail (on land) from the supply unit (usually at the Factories) to the unit that needs the supply for the supply to be consumed.
3. Advanced Supply + NO Auto Supply - Supply needs to be produced and Supply must be moved manually via unbroken chain of Transports (at sea) and Rail (on land) to the region that contains the unit that needs the supply.
Without supply a unit cannot move (and attack).
We are playing with option 1 a very simplistic supply simulation so we can focus on the other game mechanics (move, combat, production, research). I personally play with option 2 in single player games, it creates a lot more realism.
Notice with option 2 or 3 that the attack on England would have been ALOT harder if the supply chain of transports needed to be maintained.
Also no need to worry about the middle east if we look at a logistics view of the map there is no rail in Persia so that is as far as the Germans go (no supply into Persia = no movement), and Africa has no means of supplying unitts either except the coastal regions by Sea.
Logisitics View (lower right number is rail, 1 rail = 35 Transport Capacity):
