|It's an interesting poem, I do like it, but it needs to be cleaned up a little.
In this line: "My brother’s and I herd the song humming in our ear,
I'm assuming you mean heard and not herd.
I really like this:
“To arms! Grab sword and shield , I say”,
was the song the horn did play,
A lot. Though the comma seems out of place.
We cry, “Our shields are strong our swords are sharp and we are not afraid to die!”,
needs breaking up to make it easier to read.
And this line
Till death gripped my brother’s soul and squeezed till like a river his blood did run,
I find very hard to read but not sure what you need to change.
It's a really good poem, it has this weird feel to it that I really like, a true fantasy feel but darker all the same.