Answer:
What runs around a soccer field, but doesn’t move?
In a tunnel of darkness lies a beast or iron. It can only attack when pulled back. What is it?
Turns me on my backs and open up my stomach. You will be the wisest of men though at start a lummox.
I am a protector of the scoreboard.
Blade to blade I always win My foe laid low and even. Yard by yard through thick and thin I'm busiest in season.
Bury deep, Pile on stones, My mind will always Dig up them bones