“Freedom,” Junger’s latest book, begins in the middle of a mysterious pilgrimage: “The country opened up west of Harrisburg and suddenly we could drink from streams and build fires without getting caught and sleep pretty much anywhere we wanted. We’d walked the railroad tracks from Washington to Baltimore to Philly and then turned west at the Main Line and made Amish country by winter.” These lines have a lovely roll, the tone is heroic — they made Amish country by winter.