Divide and Rule — L. Sprague de Camp

DIVIDE AND RULE
What happens when the "hoppers" (invaders from another world, they look rather like kangeroos) take over? Well, knighthood flowers, for one thing--knighthood enforced by the aliens, who see it as an easy way of keeping Earth's population in subjection. But knighthood (in spite of a few drawbacks like uncomfortable armor) comes naturally to Sir Howard Van Slyck, second son of the Duke of Poughkeepsie. His family motto is "Give 'Em the Works"--and the hoppers wind up learning exactly how distasteful the "Works" of human ingenuity can be.

THE STOLEN DORMOUSE
The Earth turns feudal again, but this time it's through its own doing. Giant corporations have turned into clans within the American Empire, clans that do not hesitate to do battle when honor is at stake. The Crosleys and the Strombergs are in a kind of cold war when the incident of the disappearing dormouse--an engineer in a state of suspended animation--precipitates a chain of violence that is as hilarious as it is exciting.