On August 25, 1814, British forces destroyed the Library of Congress containing 3,000 books during the War of 1812. An excerpt from the article:
"THOMAS JEFFERSON HELPED REBUILD THE LIBRARY OF CONGRESS CATALOG AFTER A FIRE.
Not long after it was established, tragedy struck the Library of Congress: Its contents were destroyed when the Capitol Building was set on fire by British troops during the War of 1812. Approximately 3000 books (mostly law-related) were lost in the blaze, but luckily a friend of Washington D.C. owned a collection that was even bigger. Thomas Jefferson’s personal library comprised well over 6000 volumes, making it the largest library in the country at the time. He agreed to sell all of his books to Congress for $23,950 in 1815. Jefferson's contributions significantly expanded the scope of the library, by including books on art, science, and philosophy. (The increased diversity of the collection was a subject of criticism at the time, to which Jefferson responded by saying "there is in fact no subject to which a member of Congress may not have occasion to refer.”) Sadly, the library met with another tragedy when a second fire tore through it on Christmas Eve 1851, burning two-thirds of Jefferson’s contribution."