On the Pennsylvania frontier they were Germans and Irish, Delawares and Iroquois, with names like Weiser, Croghan, Shickellamy and Osternados. These were the wood's men, at home in the woods, knowledgeable in the ways of the other, able to negotiate the thickets of cultural misunderstanding and mistrust. From the Quaker colony's founding in the early 1680s into the mid-1750s, they did the hard, dirty work that helped maintain the fragile long peace...