But such was the potency of the tank myth that after the war it seduced generals and historians on both sides, until the myth was finally brought to reality in the mobile battles that engulfed Europe just thirty years later. In this new look at one of the century's most important battles, Bryn Hammond tells the story of what exactly happened at the end of 1917, and how the myths that were created in those tragic two weeks were to change the face of warfare forever.