Question: United States Army post, Fort Elliott, was named for a casualty of the Battle of Washita River, which occurred on what day?
Sentence (from "Fort Elliott"): Fort Elliott was a United States Army post in the Texas Panhandle, operational between 1875 and 1890 and named for Major Joel H. Elliott, a casualty of the Battle of Washita River in 1868.
Relevant evidence: Yes