The Battle of Gettysburg was bloody and brutal. It ended three days after it started, on July 3, 1863, leaving almost 50,000 casualties strewn across the Pennsylvania fields. The northern advance of the Confederate Army, led by General Lee, had come to a halt due to miscalculations and was now in retreat thanks to the military skill of Union General Meade. President Abraham Lincoln would visit the battlefield five months later to give his famed Gettysburg Address and to dedicate the Soldiers’ National Cemetery, and the legacy of Gettysburg would live on, in cycloramas and re-enactments, history texts and documentaries. The American Civil War was one of the first wars depicted in photographs, not paintings. Mathew Brady and his team of 17 assistants crisscrossed the battlefields with portable darkrooms, capturing the actors of war and the aftermath of fighting. Below, on the 150th anniversary of the Battle of Gettysburg, are images from the small Pennsylvania town that many historians say was the turning point of the Civil War.