It consists of several branches, including the Infantry, the conventional infantry Royal Panzer Infantry, its Knightmare pilots the Royal Armored Corps, consisting of the older main battle tanks and other armored vehicles and the Support Services, which carries out logistics, intelligence, and other functions.

As the main conventional army force of the Empire, it is tasked with defending the country from external enemies and garrisons Britannia's numerous colonies, being one of the most visible faces of occupation to many citizens.

The Britannian Army, also called the Britannian Ground Forces, is the main land warfare force of the Holy Britannian Empire.