Slaughterhouse World - A Tale of the Human-Knacker War

They came from outer space, these hideous, intelligent monsters, and they wanted our colonies, our goods, even our flesh. They looked like a cross between a spider and a crab, except bigger—much bigger—and meaner—much meaner—and they never stopped coming! World after world has been devastated, and man has been forced into a continuous defensive retreat.

Joel Karsh is just a grunt slugging it out on Planet 3G 789, a bug factory world, where fresh protein (i.e., human flesh) is being processed...