Lyric discussion by proman232 

Cover art for Shepherd of Fire lyrics by Avenged Sevenfold

To me, this song is about some major catastrophe, like a war, or a terrorist attack, and only one person, backed by however many people he can find, is fighting everything. This view also makes its use as the opening theme to the BO2 Zombies map Origins make sense, as the characters are the only ones fighting the zombies.

My Interpretation