 Complete the following phrase:  Gavin Long selected the authors of the series, and these appointments were approved by a government committee. Long required that the authors have some or all of three positive qualifications: experience of the events, proved ability to write lucidly and engagingly, and training as a historian. It was also decided that authors would not be able to write on topics in which they had played a leading part during the war. Selecting and engaging authors took up much of Longs time, and some potential authors declined offers of appointment. A replacement author for Chester Wilmots volume on the 