keeping captured planets

[Suicide Junkie]

I was playing a simultaneous game, and the ships in orbit were getting a battle every turn.

They just sat back out of range, so I suppose the contested colony is not considered a valid target except by troop transports.

quote:

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One thing that occurs is that the invasion makes the population unhappy quickly, so the defenders can only build new defenders there for a short time, unless there are construction bases to build more.

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What about the defender "attacking" the planet with troop transports? Can you drop more defender troops to help out?
If the battle is going to be Lasting a year, you'd have plenty of time to collect some ships from neighbouring colonies/systems, smash the attacking fleet, and drop reinforcements.