The series consist of 9 books originally written over a 3-year period beginning in 1980. Mahoney, we learn, has often been promoted and busted in his long career. During the period of the Novels, May 1944 to December 1944, Mahoney is a Master Sergeant, that serves in special missions with the Rangers, and as a Company Sergeant, Platoon Leader, and Squad Leader in the "Hammerhead" Division. Mahoney, with his always present side-kick, Corporal Edward Cranepool, become involved in several of the key battles for the liberation of France, and invasion of Germany. Mahoney, as a US Army Ranger aides the French Resistance before, during, and immediately after the June 6, 1944 D-Day invasions of France. Later, tired of always finding himself involved in "suicide" missions, Mahoney and Cranepool transfer to the "Hamerhead" Division in General George S Patton's 3rd Army. With the Hammerheads, Mahoney participates in the battles of the hedgerows after the Normandy invasions, the liberation of Paris, the crossing of the Moselle and battle for Metz, and the defense of Bastogne.