You have made good on your promise to Éomer and have provided for the continued maintenance of Aldburg. Now you should see how Éowyn's work has progressed.
'I cannot thank you enough for all you have done. You have aided Aldburg and its people in ways I was unable to do myself, but I should not be surprised at your ability. After all, Éomer did send you to assist me! Éomer possesses wisdom far beyond his years, and he uses it not just on the field of battle but in times of peace, as well!
'There have been fewer of those in recent memory, alas.
'You return now to Edoras? Go with my good wishes, and may you help the folk there as you helped the people of Aldburg!'
Horn will speak to you again by the barrows outside Edoras, as he did once before.
Horn is by the barrows outside Edoras, in Kingstead.
Horn has asked you to tell him when you are ready to walk through the streets of Edoras with him and your companions.
Éowyn is outside Meduseld, in Edoras.
You have learned that an ally of Wormtongue's attempted to sabotage the evacuation efforts, but may have fled the city.