His Last Command (Gaunt's Ghosts)

Second in the new Gaunt's Ghosts sequence, The Lost. Returning from a long mission on a Chaos world, Commissar Gaunt finds that his old regiment, the Tanith First-and-Only, has been redeployed under a charismatic new commander. As the fighting becomes bitter, Gaunt is finally reunited with his men as the Imperial forces make one last desperate attempt to hold the line against the invaders.