The King of the West had many enemies to subdue. Wherever Elesser went with war, Eomer went with him, beyond the Sea of Rhun the thunder of the cavalry of the Mark was heard.
Description:
Fourth Age Year 2 - "The King of the West had many enemies to subdue before the White Tree was to grow in peace. And wherever King Elesser went with war, King Eomer went with him; and beyond the Sea of Rhun and the far fields of the South, the thunder of the cavalry of the Mark was heard, and the White Horse upon Green flew in many winds until Eomer grew old." Gondor and Rohan engage the Tribes of Easterlings, in a final last massive cavalry battle.