Astral Knights - Notable Campaigns: Castigation of Acralem (799.M41) - The Flesh Tearers, working in conjunction with the Astral Knights, the Grey Knights of the 3rd Brotherhood (which included Kaldor Draigo) and nine regiments of the Astra Militarum, descended upon the Imperial world of Acralem to halt the Daemonic incursion of the infamous Daemon Prince M'kar the Reborn and his Daemon army. What followed was one of the most terrible battles of that century, though ultimately the Imperial forces proved victorious and M'kar was banished back to the Warp for a time.Battle of Safehold - Assault on the Necron World Engine (926.M41) - The massive mobile artificial Necron Tomb World of Borsis, known to the Imperium as the World Engine, was attacked in the Vidar Sector in 926.M41 by an Imperial task force comprised of 15 Space Marine Chapters, plus elements from the Imperial Navy, and even the mightiest weapons the Imperial forces could bring to bear could not harm it. Drop Pods and torpedoes could not penetrate its Void Shields and it was impossible to lock on to with teleport beams. The Imperial task force tried twelve times to overwhelm it through sheer valour and firepower and was rewarded with a string of destroyed and crippled starships and millions of casualties. The World Engine destroyed a third of an entire Imperial Navy battlefleet before the Chapter Master of the Astral Knights decided to ram the hideous vessel with his Battle Barge, the Tempestus. It was only when the enormous Space Marine starship collided with the Necron construct's shields that they finally failed, allowing the Imperial forces to approach their target. A force of over 700 Astral Knights deployed from Drop Pods onto the Necron vessel's surface. For over 100 solar hours the Astral Knights fought against tens of thousands of Necron warriors and destroyed every flux generator, weapon forge and command node they came upon. Only after the Chapter had been reduced in size to the Chapter Master, Artor Amhrad, and five battle-brothers did they succeed in their quest. Amhrad detonated Melta Bombs that destroyed a vast Necron tomb complex that housed many of the World Engine's command arrays. This brought down the vessel's impenetrable Void Shields and also silenced the machine's weaponry. This assault allowed the Imperial Navy's starships to destroy the World Engine with Cyclonic Torpedoes. After the battle, as the Adeptus Mechanicus picked over the remains of the destroyed World Engine, the Ultramarines retrieved the twisted wreckage of the Tempestus and placed it amid the ruins of Safehold, the planet that had been the last victim of the World Engine. The 2nd and 4th Companies of the Blood Angels had been amongst the Astartes task forces despatched to the Vidar Sector to assist their fellow Space Marines against the threat posed by the World Engine. After the sacrifice of the Astral Knights led to the final destruction of the World Engine, Captain Donatos Aphael of the 2nd Company proposed that an Imperial shrine be erected upon the world of Safehold in eternal memory of the Astral Knights Chapter. The shrine consists of seven hundred and seventy-two arbalstone statues, one for every Astral Knights battle-brother that died stopping the World Engine, which stands a silent vigil within the dead heart of the Tempestus. From that day forth, two Blood Angels of the 2nd Company, and battle-brothers from nearly a dozen other Chapters, are always assigned to stand guard over the memorial, which is considered a singular honour for the Astartes that fought beside them for the last time.