ottarrus
Emperor Mongoose
Hmm, except this apocalyptic scenario of desolation isn't what generally happens in the boardgame of that action produced by GDW (Invasion: Earth). The Imperial player usually takes Luna to use as a forward base, then deals with Terra's SDB squadrons (or at least suppresses them by causing them to hide outsystem or in the ocean), then suppresses the planetary defence batteries (I agree here is where collateral damage may well occur, depending on where they are deployed by the Terran command and on the tactics used to suppress them). Then you land through meteoric assault and seek a lodgement in an out-of-the-way location, make the Terrans come to you to try to evict your foothold, and defeat them in detail on the ground.
Yes, this takes a huge invasion force, and time, which certainly means the Imperium isn't able to use those resources chasing Wolfe's fleet to ground.
And here we come back to two points I routinely make about planetary invasions.
1. The board games do not accurately depict the issues, conditions or results of the role playing game. GDW has said this many times.
2. There is literally no point in destroying a civilization just so you can adjust a line on a stellar map. It is sheer foolishness to utterly wreck that which you hope to preserve by invading the world to begin with. If you have to murder a billion people to make your point, your point is pointless.
As for Operation Prodigal Son, Wolfe's fleet was already wrecked at the Battle of Dingir. Wolfe abandoned Terra because his fleet was a shambles. Adair's operational goal after Wolfe fled was twofold:
a] She couldn't leave world with millions of enemy troops and functioning industry in her rear if she chose to pursue Wolfe, and
b] Taking Terra would put to rest for all time the Solomani belief that they were somehow superior to anyone else.
The results are obvious. Admiral Baroness Adair's descendant is now Archduke of Sol, Terra is scheduled to be returned to her people as a loyal member world of the Third Imperium, and literally everyone rolls their eyes and treats a Solomani activist like they're an idiot when they start spouting their propaganda.
And none of that would have been possible if Adair just tipped a rock into Earth because it was the easy way.