In The Call of the Wild, what was the name of the Indian group that attacked John Thorton?

The name of the ferocious tribe was the "Yeehats."  The attack occurs in Chapter 7.  Buck comes upon the maurading band:

"The Yeehats were dancing about the wreckage of the spurce-bough lodge when they heard a fearful roaring and saw rushing upon them an animal which they had never seen before.  It was Buck, a live hurricane of fury, hurling himself upon them in a frenzy to destroy....It was a fateful day for the Yeehats.  They scattered far and wide over the country and it was not until a week later that the last of the survivors gathered together in a lower valley and counted their losses.  As for Buck...he found Pete where he had been killed...Thornton's desperate struggle was fresh-written on the earth..."