Well my game is going swimmingly right up until barbarians took over Mars somehow. The population shows up as 'vanquished' and now barbarians are somehow bombarding the planet and killing the population even though I don't see any hostile ships. However speaking of hostile ships, all the civvy ships that were around mars at the time including one of my OWN ships had to 'surrender' and are now in orbit around mars doing nothing.
What can I do to take mars back? Do I need to send troop transports with heavy assault brigades? And if so, how many troop transports on a ship should I build?
If that's not the answer, how can I retake my planet from these...space barbarians?
UPDATE: The population has been changed from 'Vanquished' to 'Subjugated'. I just sent two heavy assault brigades to the planet. Can I get a list of how much room a unit takes up so I don't grossly overproduce troop transport space or underproduce it?
Also, again, knowledge on how to deal with this problem would be greatly appreciated.