This book is compiled from the records maintained by the Commonwealth War Graves Commission of servicemen and women killed or missing since the start of the First World War in 1914. The first section contains details of the location on the Thiepval Memorial of servicemen or women who were one of five or less of their particular service rank or unit who lost their lives. I have also identified where winners of the Victoria Cross can be found. The second section contains details of the location of the grave in the Thiepval Anglo-French Cemetery of the servicemen who were one of five or less of their particular service rank or unit who lost their lives. The third section contains details of the location of the grave in the Thiepval Connaught Cemetery of the servicemen who were one of five or less of their particular regiment or service who lost their lives. The fourth section contains details of the location of the grave in the Thiepval Mill Road Cemetery of the servicemen who were one of five or less of their particular regiment or service who lost their lives. Every life lost as a result of military service is a tragedy for the family and friends of the individual, and this book does not seek to imply that those listed here are any more deserving of memory than those not selected. The book shows the wide range of units from which only a handful, or even a single, life was lost, and also the wide range of ranks where also only a handful, or even a single, holder of that rank is commemorated in Thiepval. The CWGC lists 584,992 names of dead and missing service personnel who are remembered at locations in France. Of these just over 73500 (12.6%) are to be found in the four sites studied in this survey.