James Abram Garfield was the 20th president of the United States, serving from March 1881 until his death the following September after being shot by an assassin in July. A preacher, lawyer, and Civil War general, Garfield served nine terms in the United States House of Representatives and is the only sitting member of the House to be elected president. Before his candidacy for the presidency, he had been elected to the U.S. Senate by the Ohio General Assembly—a position he declined when he became president-elect.

The Battle of Chickamauga, fought on September 18–20, 1863, between the United States Army and Confederate forces in the American Civil War, marked the end of a U.S. Army offensive, the Chickamauga Campaign, in southeastern Tennessee and northwestern Georgia. It was the first major battle of the war fought in Georgia, the most significant US defeat in the Western Theater, and involved the second-highest number of casualties after the Battle of Gettysburg.