Things that spring to mind when I hear this music:
1. An army rises from the south, Orcs give their warcries and their wolves howl with the sound of the horn. They march with the beat of the drums as they number in the tens of thousands towards the Fortress of Gelubury and its poor surrounding villages.
2. Rise of the machines against the naive population of a complacent and unprepared urban metropolis.
3. Mountain climbing montage music! In the bitter cold and wintery range.