ARMY & NAVY JOURNAL,  New  York, Sept. 5, 1863 

* Abraham Lincoln admits he was wrong
* General Ulysses S. Grant's victory

As noted in the masthead this was the: "Gazette of The Regular & Volunteer Forces" and as such is replete with military news of all sorts.
The most notable content is the page 3 letter headed: "The President To General Grant". In this remarkable letter, President Abraham Lincoln congratulates General Grant for an important victory -- the capture of Vicksburg, Mississippi, on July 4, 1863. Lincoln differed with Grant about how to handle the campaign, but when Grant pursued his own strategy successfully, Lincoln frankly admitted that Grant was right, the letter ending with the famous sentence: "I now wish to make a personal acknowledgment that you were right and I was wrong." and signed in type: A. Lincoln (see). Terrific to have this content in a military newspaper.
Other content includes: "The Military Situation" taking most of the front page; a lengthy letter signed by: G. T. Beauregard; "Forts of Sand or Masonry: Which?" "The Naval Academy - Regulations as to Admission" and much more.
Sixteen pages, 10 by 14 1/2 inches, very nice condition.