Black WaldenConcord, Massachusetts, has long been heralded as the birthplace of American liberty and American letters. It was here that the first military engagement of the Revolutionary War was fought and here that Thoreau came to "live deliberately" on the shores of Walden Pond. Between the Revolution and the settlement of the little cabin with the bean rows, however, Walden Woods was home to several generations of freed slaves and their children. Living on the