Instruct: Classify an Amazon review as either positive or negative.
Query: Excellent!

I just happened to find this book while I was reading Stephen Sears's "Gettysburg." The 3-D map of the Gettysburg battlefield on the last page of this book helped me to understand the importance of terrain in this battle. Unlike the traditional paper map you find in most books about the war, in Frey's book you can literally run your finger across the terrain and feel the high rise of Round Top and the low ground around the angle where Picketts' Charge took place. This 3-D map helps you to understand why Lee chose to attack that topographically shallow point of Cemetary Ridge. This book is invaluable. I wish Frey would do an entire book of these 3-D maps of various Civil War battlefields. I also liked the other 3-D displays as well. I recomend this book to everyone: child and adult alike.