By June 1953 the Korean War, marked at the outset by extremely fluid advances and retreats up and down the peninsula, had settled into position warfare very near the original pre-war demarcation line between North and South Korea. At this point both sides were fighting to win a peace, to achieve incremental advantages that could be translated into gains at the peace negotiations in Panmunjom. These last days of the war saw savage battles for control of important local terrain features, and in the trench warfare of the Chorwon Valley a young U.S. Army lieutenant was assigned to lead an...