In the summer of 2014, David Hargreaves was invited by Robert Cottrell, the editor of The Browser, to write a series of articles shadowing, week by week, the course of the first world war. Over the next four years Hargreaves and his researcher and co-author, Margaret-Louise O’Keeffe, brought these out online, and they have now been published, originally by subscription, in a set of four volumes that runs in all to a monumental 2,200 pages.