In particular, while in the army he met Sergeant Mervyn Bunter, who had previously been in service. In 1918, Wimsey was wounded by artillery fire near Caudry in France. He suffered a breakdown due to shell shock (which we now call post-traumatic stress disorder but which was then often thought, by those without first-hand experience of it, to be a species of malingering) and was eventually sent home. While sharing this experience, which the Dowager Duchess referred to as "a jam", Wimsey and Bunter arranged that if they were both to survive the war, Bunter would become Wimsey's valet. Throughout the books, Bunter takes care to address Wimsey as "My Lord". Nevertheless, he is a friend as well as a servant, and Wimsey again and again expresses amazement at Bunter's high efficiency and competence in virtually every sphere of life.