Elfhelm
From the One Wiki to Rule Them All, the Lord of the Rings Encyclopedia.
Elfhelm was a noble man in the king's court, with the title of Marshal. He was born in TA 2845. During the War of the Ring, he fought in the Battles of the Fords of Isen with Théodred and Grimbold. He also led a company under Theoden to Gondor and war. It also happened to be the company that Eowyn, under the guise of Dernhelm, and Merry, were in.
He led the company on the right against the war machines and drove the enemy into the fire pits. He survived the battle and was left in charge of 3000 Rohirrm while the Company of the West rode to the Black Gate. He guarded the pass from Anorien and prevented invaders from attacking eastern Rohan. After the war, he was granted the position of Marshal of the East-Mark by King Eomer.
