Confederate Civil War reenactors launch an evening attack during a three-day Battle of Gettysburg re-enactment on June 29, 2013 in Gettysburg, Pennsylvania. Some 8,000 reenactors from the Blue Gray Alliance participated in events marking the 150th anniversary of the July 1-3, 1863 Battle of Gettysburg. Confederate General Robert E. Lee's Army of Northern Virginia was defeated at Gettysburg, considered the turning point in the American Civil War. #

Dead horses surround the damaged Trostle House, results of the Battle of Gettysburg, in July of 1863. Union general Major General Daniel Sickles used the farmhouse as a headquarters and Union and Confederate troops fought among the farm buildings during the fierce battle. #

Members of the United States Sanitary Commission poses outside the tent during the Battle of Gettysburg in July 1863 during the American Civil War. The women and men are not identified. #

Photographer Timothy H. O'Sullivan took this photo, one half of a stereo view of Alfred R. Waud, artist of Harper's Weekly, while he sketched on the battlefield near Gettysburg, Pennsylvania in July of 1863. #

Famed Civil War photographer Mathew B. Brady captures the town of Gettysburg, Pennsylvania with his camera shortly after the three-day Battle of Gettysburg, July 1-3, in 1863. Hospital tents can be seen in the field at right. #

John L. Burns, the "old hero of Gettysburg," with gun and crutches, in Gettysburg, Pennsylvania, in 1863. During the Battle of Gettysburg, Burns, a 70-year-old civilian living nearby, grabbed his flintlock musket and powder horn and walked out to the battlefield to join in with Union troops. The soldiers took him in, and Burns served well as a sharpshooter. During a withdrawal, Burns was wounded several times and left on the field. he managed to get himself to safety, his wounds were treated, and his story elevated him to the status of National Hero briefly. #

(Left) Dead horses litter the road outside the Leister farm, which was used as the headquarters of Union General George Meade during the Battle of Gettysburg on July 7, 1863. (Right) Cyclists ride along Taneytown road, passing the Leister farm on on June 30, 2013 in Gettysburg, Pennsylvania, 150 years after the Battle of Gettysburg. #

Reenactors watch a demonstration of a battle during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg, at Bushey Farm in Pennsylvania, on June 29, 2013. #

An actor playing a Confederate soldier marches before waging a reenactment of The Battle of Little Roundtop during the Blue Gray Alliance events marking the 150th anniversary of the Battle of Gettysburg, on June 30, 2013. #

Confederate Civil War reenactors from Hood's Texas Brigade launch an evening attack on Union troops as part of a three-day Battle of Gettysburg re-enactment on June 29, 2013. #

Actors playing Confederate and Union troops lay "dead" after a re-enactment of The Battle of Little Roundtop during the 150th anniversary of the Battle of Gettysburg, on June 30, 2013. #

Geoff Roecker, from Brooklyn, New York City, playing a member of the Constitution Guard, lounges in camp the morning of the final day of the Blue Gray Alliance re-enactment marking the 150th anniversary of the Battle of Gettysburg, on June 30, 2013. #

Confederate Civil War reenactors fire a cannon towards Union positions ahead of Pickett's Charge on the last day of a Battle of Gettysburg re-enactment on June 30, 2013. Pickett's charge was named for the Confederate Maj. General George Pickett, whose division of rebel troops was annihilated in the attack. #

William H. Hincks, right, portrays his great-great-grandfather, Medal of Honor recipient William Bliss Hincks, taking a Confederate flag from a color bearer portrayed by Skip Koontz, center, of Sharpsburg Maryland, at a re-enactment of Pickett's Charge, on June 30, 2013. #

Actors playing Federal and Confederate troops shake hands after re-enacting Pickett's Charge during events marking the 150th anniversary of the Battle of Gettysburg, on June 30, 2013. #

Tim Jenkins of Virginia views the battle site called Devil's Den from Little Round Top, during the 150th anniversary of the Battle of Gettysburg, on July 1, 2013, in Gettysburg, Pennsylvania. #

Remains of Civil War soldiers lie buried at the Soldiers' National Cemetery on the 150th anniversary of the historic battle on July 1, 2013 in Gettysburg, Pennsylvania. Thousands of Civil War soldiers are buried at the site. Union and Confederate armies suffered an estimated combined total of 51,000 casualties over three days, the highest number of any battle in the four-year war. #

Reenactors stand near luminaries that mark the graves of Union dead at Soldiers' National Cemetery during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg, on June 30, 2013. #