The first documented attack of a Tyranid Hive Fleet upon the Imperium was at the outpost of Tyran. The Tyranids overran this isolated outpost of the Adeptus Mechanicus with overwhelming force, and stripped the world of all life. By the time Inquisitor Kryptman of the Ordo Xenos arrived, to investigate the strange planet-stripping phenomenon, it was already too late. It took a full Terran century for the Ultramarines to recover their full strength, and only now is the Chapter Banner of Ultramar allowed to be carried into battle forcefully once more by a full-sized Ultramarine Chapter.