You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "When was the company responsible for delivering messages, newspapers, and mail in the Butterfield Overland Mail route?" whose answer is 1858-1861.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Butterfield Overland Mail company
Useful Output:

Doc 1: Moving Forward. As a result, the Butterfield Overland Mail Company was organized in 1857 after negotiating a contract with the U.S. government.
Doc 2: On a September evening in 1858, a Concord coach set out on a history-making journey – the first run of the Overland Mail Company.
Doc 3: Butterfield's Overland Mail Company carried the first successful overland transcontinental mail by stagecoach through Arkansas as it went
Doc 4: In 1857 John Butterfield's Overland Mail Company was awarded the U.S. government contract to deliver mail to the Pacific coast. The company operated a 25-day,
Doc 5: Mail Call! In 1857, businessman and transportation entrepreneur John Butterfield was awarded a contract to establish an overland mail route