Having located its boundaries, I commenced at the southeast corner, and gradually moving toward the _north_, I looked toward the _west_, and sketched it carefully, as far as the vision extended, including fields, forests, houses, barns, hills, and valleys; and every object, however minute, which would influence the result of a battle. Thus I continued to the northeast boundary, a distance of five and a half miles. The next day I resumed my work at the south (having advanced to the point where my vision had been obstructed the preceding day), and sketched another breadth to the north, as before: and so continued, day by day, until I had carried my Drawing forward four and a half miles, which included within its limits the town of Gettysburg. When the Battle-field had been _Isometrically_ drawn. I sketched in the _distance_ and added a sky. This Drawing was the result of eighty-four days spent on that field immediately after the battle, during which time I sketched accurately the twenty-five square miles which it represents. I spent two months in hospital writing down the statements of Confederate prisoners, and as they became convalescent, I went over the field with many of their officers, who located their positions and explained the movements of their commands during the battle. I then visited the ARMY OF THE POTOMAC, consulted with its Commander-in-Chief, Corps, Division, and Brigade commanders, and visited every Regiment and Battery engaged, to whose officers the sketch of the field was submitted, and they, after careful consultation, located upon it the positions of their respective commands. [Illustration: PHILLIPS' 5th MASS. BATTERY] From the information thus obtained, I have traced the movements of _every Regiment and Battery_ from the commencement to the close of the battle, and have located on the Drawing its most important position for each of the three days. Since its publication I issued an invitation to the officers of the Army of the Potomac to visit Gettysburg with me, and point out their respective positions and movements, thus giving an opportunity to the _actors_ in this great drama to correct any misapprehension, and establish, while still fresh in memory, the facts and details of this most important battle of the age. This invitation was responded to by over one thousand officers engaged in the battle; twenty-eight of whom were Generals commanding. And it may be interesting to those who possess the Drawing, to know that _but one solitary Regiment_ was discovered to be out of position on it. Many thousand copies of this work have been sold, yet the demand still continues, and orders are constantly coming in from all parts of the country. Though complete in itself, it is really but the _introduction_ to other works yet to be published on this battle, and will be considered almost an indispensable companion to the history of it. It can be furnished at the following: PRICES.