It had been all used, the last least bit of it.

Every muscle, every fibre, every cell, was tired, dead tired.

And there was reason for it.

In less than five months they had travelled twenty-five hundred miles, during the last eighteen hundred of which they had had but five days' rest.
When they arrived at Skaguay they were apparently on their last legs.
They could barely keep the traces taut, and on the down grades just managed to keep out of the way of the sled.
"Mush on, poor sore feets," the driver encouraged them as they tottered down the main street of Skaguay.

"Dis is de las'.