While carrying out his missions, Eisenhower sent over one hundred letters to Marshall, his superior officer, mentor, and chief supporter. The seventy-five letters published and analyzed here trace the growth of the relationship between Eisenhower and the man who had elevated him to the position of Supreme Commander. They also describe Eisenhower's response to the problems he faced in commanding the largest and most complex military organization in history. This collection offers an interesting and penetrating look at the events that transpired and the man who orchestrated them.