Between July 1 and July 3, 1863, massive Union and Confederate armies fought in the fields and hills around Gettysburg, Pennsylvania. By the time the smoke cleared close to 50,000 men were casualties.Remembered as one of the bloodiest battles in American history, 7,863 Americans lost their lives on the fields of southeastern Pennsylvania during the Battle of Gettysburg, including 3,155 Union and 4,708 Confederate troops.