Jack Sheldon is the foremost authority on the German army that fought in the British sector of the Western Front, is used as an expert for specialist tours of the battlefields and, in addition to his several volumes in the Geman Army at … series, has produced several titles of his own for the Battleground Europe series and co-authored several more with Nigel Cave.Nigel Cave is the founder editor of the Battleground Europe series; his association with the Company goes back some thirty years.