Answer:
Two little holes in the side of a hill. Just as you come to the cherry-red mill.
Two in a whole and four in a pair. And six in a trio you see. And eight's a quartet but what you must get. Is the name that fits just one of me?
What gets beaten, and whipped, but never cries?
Add a T and I shoot through the sky. Then add an S and I multiply. What word is it?
It can pierce the best armor and make swords crumble with a rub, yet for all its power It can't harm a wooden club.
Before Google, we actually had to physically look things up in this building full of knowledge.