Quotation from: The Valley of the Moon

Written by: Jack London

Billy accepted the challenge, and found in all truth that the
other was rightly nicknamed. In the training camps Billy had
sparred and clinched with giant champions like Jim Jeffries and
Jack Johnson, and met the weight of their strength, but never had
he encountered strength like this of the Iron Man. Do what he
could, Billy was powerless, and twice his shoulders were ground
into the sand in defeat.