The Gathering of the Clouds ----------Howard Shore

(You can find it by searching the Hobbit 3 movie soundtrack album, the full name of the album is The Hobbit: The Battle of the Five Armies (Original Motion Picture Soundtrack) [Special Edition])

(The melody appears around 01:08 seconds)

I found this song after listening to it for a long time Yes, I hope this song is what you want. If you are satisfied, please accept it. Your acceptance is the motivation for my answer:)

(Note: If you want to listen to this melody repeatedly, Huo2li Valley Town Original music Thrice Welcome----Howard Shore's melody is similar to this song, you can listen to it)