Space War

In James Blish's Cities In Flight, the Vegan War and the investment of Vega, with an Admiral later convicted of genocide, occur between Volumes I and II.

Poul Anderson describes space battles in The People Of The Wind and Ensign Flandry.

During the First Man-Kzin War, the UN Space Navy, having recently acquired the hyperdrive, learns how to invest a planet:

"Hammerblows from space, utterly unexpected, wrecking the ground defenses and what small warships were deployed at Hssin. Then the landing craft floating down on gravity polarizer drive, hunting through the shattered habitats and cracking them one by one. Hssin had unbreathable air, and it had been constructed as a maintenance base more than a fortress."
-Jerry Pournelle & SM Stirling, "The Hall of the Mountain King" IN Larry Niven, ed., Man-Kzin Wars (Riverdale, NY, 1992), pp. 5-202 AT CHAPTER THREE, p. 24.

In Cities In Flight, the FTL interstellar drive is the Dillon-Waggoner graviton polarity generator or "spindizzy" whereas, in Known Space, the gravity polarizer and the hyperdrive are different gadgets. And, despite the name, Anderson's hyperdrive is different kind of FTL drive. See also here.