I would guess that naval combat works in much the same way - contested SZs, only one round of combat.
Another thought - no mention of retreats as an option for either player. Presumably on its own turn a power can withdraw units from a contested tt, but should it suffer a penalty for doing so, assuming that only no-man’s land separates the front line in a CT?
Not sure I like the mandatory Austrian attack - will Germany have a similar obligatory move into Belgium?
The only action before Germany’s attack was Austria bombarding Belgrade, hardly the equivalent of an invasion. My turn order would be:
1. Germany, (Bolsheviks)
2. France, Britain, (Italy)
3. Austria, (Turkey)
4. Russia, (USA)
It seems there’s no heavy artillery, that is an option to bombard an adjoining tt, but looks like Battleships have this option.