Question: Which  county located in the U.S. state of Montana is Brockton  a town in
Sentence (from "Chouteau County, Montana"): The county was established in 1865 as one of the original nine counties of Montana, and named in 1882 after Pierre Chouteau, Jr., a fur trader who established a trading post that became Fort Benton, which was once an important port on the Missouri River.
Relevant evidence: No