Answer:
A mechanism to discover who is following you.
I am the red tongue of the earth, that buries cities.
They are the group who manages the winged engines of war.
If someone calls you this, it might be time to consider hot wax
The land was white the seed was black. It'll take a good scholar to riddle me that.
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.