Read it through once

Nothing daunted him. It was because nothing daunted him that he had been chosen for government courier. He took all manner of risks, resolutely thrusting his little weazened face into the frost and struggling on from dim dawn to dark. He skirted the frowning shores on rim ice that bent and crackled under foot and upon which they dared not halt. Once, the sled broke through, with Dave and Buck, and they were half-frozen and all but drowned by the time they were dragged out. The usual fire was necessary to save them. They were coated solidly with ice, and the two men kept them on the run around the fire, sweating and thawing, so close that they were singed by the flames.