The chapter opens with a description of the wound on the gastric wall. It is a deep wound, caused by an attack from a band of invading bacteria. The wound is caused by a white blood cell, a type of blood cell that destroys foreign substances. The white blood cells are called neutrophils, eosinophils, and basosphils. They are present in the bone marrow and are called band cells when they enter the blood stream. When they become segmented, they are called myelocytes. The chapter ends with a reminder that the band is not dying.