Sherman's March to the Sea (also known as the Savannah campaign or simply Sherman's March) was a military campaign of the American Civil War conducted through Georgia from November 15 until December 21, 1864, by William Tecumseh Sherman, major general of the Union Army. The campaign began on November 15 with Sherman's troops leaving Atlanta, recently taken by Union forces, and ended with the capture of the port of Savannah on December 21. His forces followed a "scorched earth" policy, destroying military targets as well as industry, infrastructure, and civilian property, disrupting the Confederacy's economy and transportation networks. The operation debilitated the Confederacy and helped lead to its eventual surrender. Sherman's decision to operate deep within enemy territory without supply lines was unusual for its time, and the campaign is regarded by some historians as an early example of modern warfare or total war. Following the March to the Sea, Sherman's army headed north for the Carolinas Campaign. The portion of this march through South Carolina was even more destructive than the Savannah campaign, since Sherman and his men harbored much ill-will for that state's part in bringing on the start of the Civil War; the following portion, through North Carolina, was less so. The March to the Sea owes its common name to a poem written by S. H. M. Byers in late 1864. Byers was a Union prisoner of war held at Camp Sorghum, near Columbia, South Carolina. During his imprisonment, Byers wrote a poem about the Savannah campaign which he titled "Sherman's March to the Sea", which was set to music by fellow prisoner W. O. Rockwell. When Byers was freed by the Union Capture of Columbia, he approached General Sherman and handed him a scrap of paper. On it was Byers' poem. Reading the paper later in the day, Sherman was so moved by Byers' poem that he promoted Byers to his staff where the two became lifelong friends. The poem would go on to lend its name to Sherman's campaign, and a version set to music became an instant hit with Sherman's Army and later the public.