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Conquest Over Time is a story written by Michael Shaara. It is an oddly amusing tale about the meeting of two humanoids civilizations through the third person POV of Pat Travis, a man that has recently been dealing with a string of bad luck. I really dug his resourcefulness and tenacity. There is a fine explanation of translation technology that is something often overlooked in stories about the meeting of two peoples. And the payoff is bang on as well.