the jurors for the 1990 lincoln prize will be robert v. bruce , professor emeritus of history at boston university ; james m. mcpherson , professor of history at princeton university and winner of the pulitzer prize for his 1988 civil war history , `` battle cry of freedom '' ; and tom wicker , a columnist for the new york times whose 1984 novel , `` unto this hour , '' dealt with the civil war battle of second manassas .