Bk 3: A world shared by three native humanoid races the cavern-dwelling Gdemiar, elvish Fiia, and warrior clan, Liuar is suddenly invaded and conquered by a fleet of ships from the stars. Earth scientist Rocannon is on that world, and he sees his friends murdered and his spaceship destroyed. Marooned among alien peoples, he leads the battle to free this new world and finds that legends grow around him even as he fights.
Le Guin's Hainish series begins with the assumption that centuries ago humanoids from the planet Hain ventured through the solar system establishing colonies on various planets including Earth. For mysterious reasons these colonies lose all contact and knowledge of each other until the 21st century when an attempt is made to establish a galactic league. Individual stories in this loosely organized series explore the inherent communication difficulties in the mingling and clash of cultures that, over the centuries of separation, have developed widely disparate social and political structures as well as a range of biological differences.