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By Callie Oettinger
![Barlows’ Knoll after first day’s battle, Gettysburg, Pennsylvania, northwest of town. July 1, 1863. Credit: National Archives.](https://www.thehistoryreader.com/wp-content/uploads/2014/05/12.gif)
Credit: National Archives.
![Headquarters of the Army of the Potomac during the Battle of Gettysburg, 1863. Credit: National Archives.](https://www.thehistoryreader.com/wp-content/uploads/2014/05/22.gif)
Credit: National Archives.
![Amputation being performed in a hospital tent, Gettysburg, 07/1863. Credit: National Archives.](https://www.thehistoryreader.com/wp-content/uploads/2014/05/31.gif)
Credit: National Archives.
![Three “Johnnie Reb” prisoners captured at Gettysburg, 1863. Credit: National Archives.](https://www.thehistoryreader.com/wp-content/uploads/2014/05/42.gif)
Credit: National Archives.
![Regiment marching down a village street, Gettysburg, Pa, ca. 1860 – ca. 1865. Credit: National Archives.](https://www.thehistoryreader.com/wp-content/uploads/2014/05/52.gif)
Credit: National Archives.
![Union breastworks. Interior view of breastworks on Little Round Top, Gettysburg, ca. 1860 – ca. 1865. Credit: National Archives.](https://www.thehistoryreader.com/wp-content/uploads/2014/05/61.gif)
Credit: National Archives.
![Part of Gettysburg Battlefield, ca. 1860 – ca. 1865. Credit: National Archives](https://www.thehistoryreader.com/wp-content/uploads/2014/05/71.gif)
Credit: National Archives
![War veteran John Burns seated outside in a rocking chair with his musket propped near the door to a building, ca 1861-1865. Credit: Library of Congress.](https://www.thehistoryreader.com/wp-content/uploads/2014/05/81.jpg)
Credit: Library of Congress.
![Col. Davis and staff of 69th Pennsylvania Infantry, Gettysburg, PA. June 1865. Credit: Library of Congress](https://www.thehistoryreader.com/wp-content/uploads/2014/05/91.jpg)
Credit: Library of Congress
![Gens. Sickles, Carr & Graham. Taken near Trostle’s barn, Gettysburg Battlefield – on spot where General Sickles lost his leg, July 2nd, 1863, ca 1886. Credit: Library of Congress.](https://www.thehistoryreader.com/wp-content/uploads/2014/05/101.jpg)
Credit: Library of Congress.
![National Cemetery, Gettysburg, Pa., 1913. Credit: Library of Congress.](https://www.thehistoryreader.com/wp-content/uploads/2014/05/111.jpg)
Credit: Library of Congress.
![Gettysburg, between ca. 1910 and ca. 1915. Credit: National Archives](https://www.thehistoryreader.com/wp-content/uploads/2014/05/121.jpg)
Credit: National Archives
![Gettysburg, between ca. 1910 and ca. 1915. Credit: National Archives](https://www.thehistoryreader.com/wp-content/uploads/2014/05/131.jpg)
Credit: National Archives
![Gettysburg, 1922. Credit: Library of Congress.](https://www.thehistoryreader.com/wp-content/uploads/2014/05/141.jpg)
Credit: Library of Congress.
![Union and Confederate Veterans Shaking Hands Across the Stone Wall at the 1938 “Blue and Gray Reunion” at Gettysburg, 1938. Credit: National Archives](https://www.thehistoryreader.com/wp-content/uploads/2014/05/151.jpg)
Credit: National Archives
![heroes](https://www.thehistoryreader.com/wp-content/uploads/2014/05/161.jpg)
Credit: National Archives.
CALLIE OETTINGER was Command Posts’ first managing editor. Her interest in military history, policy and fiction took root when she was a kid, traveling and living the life of an Army Brat, and continues today.