From the rulebook:
“New Chinese units can be mobilized on any Chinese territory that is controlled by China, including those captured in the current turn.”
Although US supplies the Artillery, it is considered to be Chinese.
HTH :-)
if one sub attacks another sub, can the defending sub submerge before being shot at?
Yes indeed.
When the attacking sub make his combat-move, the defending sub may choose to submerge or fight.
…unless there is an attacking destroyer too
Really? I had no idea. How does that make sense? If one sub submerges to flee, the other could also submerge to pursue it. Is this true that subs can submerge against other subs?
yes. they can disappear in to the dark deep sea and only the almighty destroyer can find them.