Boromir would have been so proud of Rohan for showing up to help Minas Tirith.
Boromir, who spends the whole first book speaking out about his friends and allies the Rohirrim.
Boromir, who defies the rumor that the men of Rohan now pay a tribute of horses to Sauron.
Boromir, who advocates that they travel through the gap of Rohan because of the kindness he experienced there on his way to Rivendell, when even Aragorn suspects the Rohirrim of treachery.
Imagine for a moment how proud he would have been to see the forces of Rohan cresting that hill, to hear their horns blowing as they mounted the charge to save Minas Tirith. A battle which, honestly, Theoden knew he might not return from.
Boromir would have been honored and proud to know that Theoden held his oaths to Gondor in such high regard. That he was worried to think that Denethor might not expect his army to come to the aid of Gondor
please just think about this for a moment and be sad and excited with me