. >> i'm sure that james mcpherson needs no introduction. as the nation's most renowned civil war historian, he's a professor of history at princeton university and the author of numerous books. many about the civil war. his most notable, of course, was the "batt cry o his most notable was the battle cry of freedom which t won the pulitzer prize for nonfiction. his recent book is wonderful children's book. actually, i think it is a book for all ages. wonderful children's book with pictures about the civil war. welcome james mcpherson who will talk to us today about his recently published book, "hallowed ground: a walk at gettysburg." >> thanks so much and thanks to all of you for turning out on an evening where it might be nicer to stroll along the streets of gettysburg or walk out on the battlefield in the cool of the evening. and maybe after we are done here, some of you will want to do that because it is going to stay light until 9:00 this evening. might be fun to go out there and battle the mosqitoes. i lost count of the number of times