Question: Joseph Alexander Cooper was an American soldier who commanded units at a battle fought on September 18–20, 1863 and was the first major battle of the war fought where? 
Sentence (from "Battle of Chickamauga"): It was the first major battle of the war fought in Georgia, the most significant Union defeat in the Western Theater, and involved the second-highest number of casualties after the Battle of Gettysburg.
Relevant evidence: Yes