quote:
Unfortunately I promply re-invaded so I don't know what happens to a contested world when the AI's turn comes around.
When the ai's turn comes around you get another turn of ground combat. The battle continues with however many troops you have left against the troops and militia the planet can muster.
One thing I noticed once thogh. Each turn of ground combat the militia numbers are reset to whatever amount they had at the begining of the first turn. Same thing happens if you have two troop ships and the first ships troops are repulsed.