William T. Sherman, Memoirs of General W.T. Sherman

"These men flocked to the plains, and were rather stimulated than retarded by the danger of an Indian war. This was another potent agency in producing the result we enjoy to-day, in having in so short a time replaced the wild buffaloes by more numerous herds of tame cattle, and by substituting for the useless Indians the intelligent owners of productive farms and cattle-ranches."