Kemp deals specifically with the founding of the regiment and its fortunes during the World War II. In the "The SAS at War", Anthony Kemp has used hitherto unpublished documentation in addition to drawing on more than 100 operational files which give details of the regiment's successes and blunders during the war years. He has interviewed members of the SAS during that period. The result is a book that charts the unit's largely secret wartime operations.