British General Robert Ross and Admiral Alexander Cochrane arrived in Maryland on August 19, 1814 with 4500 veterans fresh from the Napoleonic campaigns. On the 24th, having muscled past 5500 U.S. militiamen, they made it to Washington, D.C., where they torched the White House mere hours after President Madison and his wife left town. They also burned the Capitol Building, which contained the Library of Congress along with the chambers used by the Supreme Court, the Senate, and the House of Representatives.
The only government building the Brits didn’t put to the torch was the U.S. Patent Office. Dr. William Thornton, Superintendent of Patents at the time, had hundreds of important documents rushed out of the city prior to the attack. Then, when the British came, he (allegedly) persuadedthem not to immolate the Patent Office.
Tradition has it that Thornton put himself in front of a cannon aimed at his building and shouted “Are you Englishmen or Goths and Vandals? This is the Patent Office, the depository of ingenuity of the American Nation in which the whole world is interested. Would you destroy it?” The British backed off. (Sadly, the office burned down anyway 22 years later due to an accidental fire that consumed 10,000 patent documents.)