
This was done to weaken the Imperial armed forces in case of the outbreak of a future rebellion against the Emperor's rule. This was opposed to the fleets of warships assigned to the service of the Legiones Astartes, who were used for the planetary assaults that occupied the bulk of the Great Crusade.Īfter the horrors of the Horus Heresy, during the Imperial reformation overseen at the start of the Time of Rebirth by the Primarch Roboute Guilliman, the Imperial Army's fleet component was reestablished as a separate and rival service. Its vessels were dedicated to the defence of Imperial space and strategic Warp routes.

In ancient times, during the Great Crusade and Horus Heresy eras, the Imperial Navy was not an independent armed force of its own but was considered a part of the greater Imperial Army and was known as the Armada Imperialis. The battlefleets of the Imperial Navy are constantly engaging threats both inside and outside the Imperium's borders. While the Astra Militarum ( Imperial Guard) represents the Imperium's ground forces, the Imperial Navy is responsible for the fleets of starships that maintain order between the stars and planets in the Imperium, for all space and air support provided to the infantry of the Astra Militarum through its Aeronautica Imperialis branch, and for transporting those Guardsmen across the galaxy to the Imperium's myriad warzones. The Imperial Navy, known as the Navis Imperialis in High Gothic, is one of the primary armed forces of the Imperium of Man.
