Poul Anderson 
War of Two Worlds 

The twenty-year Earth-Mars war was finally over. What was left of Earth — its crumbled cities, its ruined farmlands — were firmly and completely under the rule of the Martian Archon. And this powerful planetary ruler was taking no chances: he intended to reduce the Terrans to a society of primitive agricultural tribes in less than a generation!But for David Arnfeld, ex-spaceman and Earth Base Commander, there was something in the whole set-up which did not ring true. Why had both sides muffed countless chances to end that awful war in the first year or two? And why had the two planets gone to war in the first place?In the back of Arnfeld’s mind an idea was growing…perhaps there was yet a chance to save the doomed population of Earth. But if his idea was true, and proof was available, he had to work fast. Too many people were involved in this War of the Two Worlds to let one man upset their plans.