" He had scribbled a note in pencil giving Patton authority to assume command of the four American divisions in Tunisia the moment he landed there, and Patton had taken off again directly for the front. Eisenhower had followed up his note with a memorandum of instructions. Patton was not to keep ' for one instant' any officer who was not up to the mark. 'We cannot afford to throw away soldiers and equipment ... and effectiveness' out of unwillingness to injure 'the feelings of old friends,' Eisenhower had written. Ruthlessness of this kind toward acquaintances often required difficult moral courage, Eisenhower continued, but he expected Patton 'to be perfectly cold-blooded about it.' The first old acquaintance to go had been the general who had commanded at Kasserine, a man whom Eisenhower had rated, prior to the start of the serious shooting, as his best combat leader after Patton. This general had been shipped home to spend the rest of the war excercising his top-notch paper qualifications as an elevated drill instructor. "

― Neil Sheehan , A Bright Shining Lie: John Paul Vann and America in Vietnam