What happened to the other dogs and John Thornton while Buck was away?

Everyone has been shot and killed with feathered arrows. The Yeehats are gleefully dancing Three miles out he sees a fresh trail, and he becomes more cautious. Suddenly he comes across the body of Nig, an arrow sticking from his head. He passes another dog almost dead, and then he passes the body of Hans. He sees Yeehat indians dancing around around the wreckage of the camp.