An Eored was a group of about 200 riders of Rohan. These eoreds travelled alone across Rohan, honoring different city-states like Helm's Deep, Edoras, or the Westfold. If 100 Eoreds swarmed together, it formed an Eohere. Eoreds met to form an eohere only in times of need. For example, the Battles of the Fords of Isen, or the Battle for Helm's Deep. Each Eored was led by a Marshal of the Mark. During the War of the Ring, Eowyn and Merry disguised themselves as riders and joined Elfhelm's Eored. The head Eored was led by Theoden King. After the Battle of Pelennor Fields, Eome led an Eored to honor the dead.