Many distinguished general officers, on my invitation, visited Gettysburg, and went over the field with us, and pointed out all the details of this great turning point of the Rebellion; each explaining the movements of their several commands. Among those present at different times, were Generals Meade, Hancock, Gibbon, Howard, Doubleday, Stannard, Hunt, Warren, Humphreys, Graham, Burling, De Trobriand, Wistar, and Dana; together with a large number of Field, Line, and Staff-Officers. Most of these gentlemen have since kindly called at Mr. Walker's studio, and aided the work with their advice. Many others, who were unable to meet with us at Gettysburg, have, at considerable trouble, visited the studio in New York; among them, Generals Webb, Hall, Newton, Hazard, Sickles, Ward, Brewster, Berdan, and Gates, and Generals Wilcox and Longstreet, of the Confederate Army; the latter taking great interest in the painting, and leaving me a fine letter indorsing its accuracy. This painting has been designed _strictly_ in conformity to the directions of these gentlemen, given on the field for that purpose, and from the Reports of the Confederate Commanders, furnished to me by the Government. This great representative Battle-scene has not its equal in America, for correctness of design or accuracy of execution. Gibbon's and Hays's Divisions and the Corps Artillery, occupy the immediate foreground. It is on a canvas 7-1/2 × 20 feet, and represents, not only every Regiment engaged at that portion of the field, but where the formation of the ground would admit, the entire left wing is shown. It presents such an accurate and lifelike portrait of the country, that on it the movements of the first and second day's operations can readily be traced. No important scene has been screened behind large foreground figures, or, for the want of a knowledge of the details, hidden by convenient puffs of smoke; but every feature of this gigantic struggle has, in its proper place, been woven into a symmetrical whole. A fine steel plate is also to be engraved of this picture, which will be accompanied by a _Key_, by which the position of every Regiment and Battery can be determined. PRICE OF ENGRAVINGS. Print, $10.--Plain Proof, $25.--India Proof, $60.--Artist Proof (limited to 200 copies), $100. * * * * * The following gentlemen, intimately identified with the Battle of Gettysburg, and exercising the highest commands at the battle, kindly furnished me these letters, as indorsements to an application to examine Confederate Reports of the Battle of Gettysburg at the War Department. "PHILADELPHIA, _Nov. 3, 1867_. "GENERAL:--