Filled despair over being caged and unable to win renown in battle, as well as having her love for Aragorn refused, she went to battle with the Rohirrim disguised as a man, Dernhelm, taking Merry along with her. At the Battle of the Pelennor Fields, she met in battle the Witch-King of Angmar a.k.a. the Lord of the Nazgul, of whom it was said no man could kill. Of course, Dernhelm turned out to be Eowyn, a woman, and with the help of the perilous hobbit Merry, she slew the Witch-King after his great mace broke her shield-arm. However, she became mortally wounded from his Black Breath.
At the Houses of Healing, she was healed and brought back from the darkness by Aragorn. Later, after the Host of the West left to march on the Black Gate, she met Faramir, Steward of Gondor. He saw her sorrow and bravery and pitied her, her icy beauty piercing his very heart. Helping her conquer her despair over Aragorn, Eowyn came to love Faramir and they declared their love high on the walls overlooking Minas Tirith as the One Ring was destroyed in Mount Doom. A year later, they married and Faramir became the Prince of Ithilien.
A long story short? She’s a kick-ass babe who won the heart of the lovely and sexy Faramir. Seriously, those two are OTP.