The document provides details about the Battle of Gettysburg which took place from July 1-3, 1863 between Union and Confederate forces. It summarizes the key events of each day, including Confederate General Pickett's failed charge on July 3rd that resulted in heavy losses. It also provides background information on key figures like General George Meade who led the Union forces, and General Robert E. Lee who commanded the Confederates. The 20th Maine, led by Colonel Joshua Chamberlain, successfully defended Little Round Top hill against Confederate attacks on July 2nd.