OST similarites - Avatar/Troy/Enemy at the Gates

[Croyles]

I watched Avatar about a week and a half ago and heard a trumpet riff in one of the soundtrack passages that really reminded me of another movie. After trying to rack my brain for ages and searching around I finally remembered the soundtrack of Troy, I then read that they were both composed by James Horner and from that I remember Enemy at the Gates which also had a similar riff.

Apparently im not the first to have discovered this though as theres already a video showcasing the similarities. Seems to be a signature move by Horner.

YouTube - Avatar, Enemy At the Gates, Troy, Willow Soundtrack Similarity

Probably already taken by a much older composition.