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 battle of bull run fought?" whose answer is July 21, 1861.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Battle of Bull Run date
Useful Output:

Doc 1: Date: July 21, 1861. (Show more). Location: Manassas · United  First Battle of Bull RunMap of the First Battle of Bull Run, drawn by Capt.
Doc 2:  War-style cap, and his Virginians held their ground on Henry House Hill. First Manassas: The Battle of Bull Run. At the First Battle of Bull Run
Doc 3: Resources · The U.S. Army in the Civil War: A Timeline. From the Library of Congress. · First Battle of Bull Run/Manassas (21 July 1861). A
Doc 4:  Battle of Bull Run, also known as the Battle of Manassas, which marked the first major land battle of the American Civil War on July 21st, 1861.
Doc 5: Name: First Battle of Bull Run or the First Battle of Manassas. War: American Civil War. Date of the First Battle of Bull Run: 18th to 21st July 1861. Generals