The events of Isstvan V are frequently recognised as the inciting point of the Horus Heresy, the moment when the Warmaster made his bloody betrayal openly known. Dropsite Massacre by John French is available to pre-order on Saturday, and it’s your chance to zoom in to one of the most pivotal battles of the whole Horus Heresy saga, and discover more about what happened during this fateful event.

Anyone who has even a passing interest in the story of the Horus Heresy probably knows that the Dropsite Massacre is the event that saw the Iron Hands, Salamanders, and Raven Guard shattered by a coalition of Traitors vaster than they could have imagined. But how did it feel to the Legionaries thrown into open war against their brothers, and how did the involved commanders attempt to navigate their forces through an active slaughter?
We caught up with author John French, who has written books for Warhammer 40,000 and Warhammer Age of Sigmar, alongside The Horus Heresy, to ask him about writing Dropsite Massacre, and how it felt to revisit this momentous battle.
You can pre-order Dropsite Massacre on Saturday, and follow the stories of characters like Maloghurst the Twisted, Khârn of the 8th, Castrmen Orth of the Iron Hands, and Kaedes Nex, the Blood Crow.