The true continuity is not offenses of the Americans but the character of the Blackfeet, who were an extreme specialization of savage life. Of the Plains tribes only the Comanches had a comparable ferocity and only these two tribes practiced prolonged torture. The Blackfeet refused to observe even the mild conventions of formal, temporary truce that most tribes felt bound by. Their allies and their enemies alike called them treacherous. As tough Indians, who knew and told everyone that they were tough, they not only found murder the cheapest form of trade relations but enjoyed it beyond most Indians. They were no more hostile to Americans than they were to the Flatheads, the Snakes, the Crows, and nearly everyone else.