Muster of the East-mark

During the Third Age, the Muster of the East-mark would have been commanded by one of the Marshals of the Mark, appointed as the needs of the time demanded. It was not until after the War of the Ring that the new King Éomer assigned a dedicated Marshal of the East-mark, with Elfhelm being the first to hold the post. The muster itself, however, predated these changes (it is expressly mentioned as being called during the War of the Ring, before Éomer's military reorganisation), and presumably dated back to the early history of Rohan.

The Muster of the East-mark played relatively little part in the events at the end of the Third Age, until its Riders joined the Full Muster that rode to Minas Tirith. By comparison, its western counterpart, the Muster of the West-mark, is discussed in rather more detail due to its role in the Battles of the Fords of Isen fought at this time. In the accounts of those battles, the muster in the west is also named as the Western Muster and the Muster of Westfold (strictly speaking, 'Westfold' and 'West-mark' described different areas, one within the other, but here the names seem to be used interchangeably). On that basis, we might expect that the Muster of the East-mark would also have been called the 'Eastern Muster' or the 'Muster of Eastfold', but neither of those terms is specifically recorded.