His Last Command (Gaunt's Ghosts, #9)

As war rages in the Sabbat Worlds Crusade, Commissar Ibram Gaunt returns from a hellish mission deep behind enemy lines to find his regiment has has been disbanded. The Tanith First-and-Only have been integrated into other Imperial Guard regiments, where their natural scouting skills make them first choice for the most dangerous assignments. With the horrors of his recent experiences still fresh in his mind, Gaunt faces the most difficult battle yet as he struggles to reunite his regiment and lead them to victory against the dark forces of Chaos.