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3

I think the back history and the geography are almost completely irrelevant. Two navies. One with 1990s technology (except for aviation, which is missing). One with 1960s technology (except for aviation, which is missing). The lower-tech navy has twice the tonnage. If both navies have submarines, the 1990s navy will win. The modern subs will first hunt ...


0

IMHO it would be more usual to attack a planet than to invade it, or at least to threaten the planet with attack to force their surrender. "Greetings Earthlings! You will be pleased to learn that the total extermination of your species can still be avoided by total surrender if done quickly enough."


0

It depends on if you want the planet intact. If you want to leave things intact for your usage, especially their infrastructure, then unless you want to destroy some of it to cripple them a la WWII Allied bombings of German railways, you still have to invade on the ground and fight a conventional war. This lets you use the area as either a colony or, if you ...


6

Well, part of the Island Hopping strategy had to deal with the fact that many the islands weren't lone chunks of land, but archipelago chains (Hawaii, the Philipines, Indonesia, Japan are all islands nations/states that include more than one Island... and were also part of the Pacific Theater). So many battles for one piece of territory were spread over ...


21

why invade at all? Most structures of a civilisation are probably going to be on a surface. It is, after all, more difficult to build underground than on a surface. That means that most items of value can be simply blasted from above. But you might not want to blast them from orbit because these items might also be of value to you. You might want to avoid ...


3

You can still use the island metaphor. If the defending planet is technologically advanced enough to have their own space force, then they could have a blockade of ships around the planet. Your front line is the extent of gravitational reach of the planet, or even further away depending on how fast/powerful the ships are. You could even compare artillery ...


5

They want the planet whole If they just wipe out huge chunks, humans will use nukes. If they capture the planet whole and the civilian population continues under occupation, they would be less likely to use scorched earth tactics. A planet capable of supporting life isn't likely to be that common so to have the natives turn it into a radioactive cinder ...


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