eleven o'clock
Shorty queried . `` We 'll walk back , '' Kit answered , `` if we 're not crushed in a jam . '' The sky was clear , and in the light of the cold , leaping stars they caught occasional glimpses of the loom of mountains on either hand . At eleven o'clock , from below , came a dull , grinding roar . Their speed began to diminish , and cakes of ice to up-end and crash and smash about them . The river was jamming . One cake , forced upward , slid across their cake and carried one side of the boat away .