A. B. West
Why aren't you PLAYING a game?
If someone in the Regent phase places Empire tokens on your planet, so that neither side has control, does that mean your ships have to retreat, or is it only if control passes from one side to the other-?
The rules state (Page 10 - side bar - Ships Away) that if you lose control, you must immediately move your ships to the nearest Starbase. The intent was if you have no empire tokens on a sector, you no longer control it - and therefore must move your ships to the nearest Starbase.
If your attacking forces come from different areas, do they have to retreat to each of their different area? How to keep track?
Page 9 says retreating ships must move to their previous sector. The intent was that each ship returns to where it came from - the sector they were in before movement and combat began. Usually, this is pretty simple to resolve and you shouldn't need markers to remember.