Fall of Dranam
From Warhammer 40k - Lexicanum
"It is said that the annals of war are inscribed only by those who have tasted victory, and in that it may transpire that the truth will die with us here today. Fight now not for triumph or glory, but with your heart filled with spite and vengeance, and die comforted in the knowledge that no chronicle of our darkest hour will be made."
The Fall of Dranam was a battle of the Horus Heresy.[1]