The British then entered and burned the capital during the most notably destructive raid of the war. British troops set fire to the capital's most important public buildings, including the Presidential Mansion (the White House), the United States Capitol, the Arsenal, the Navy Yard, the Treasury Building, and the War Office, as well as the north end of the Long Bridge, which crossed the Potomac River into Virginia. The British, however, spared the Patent Office and the Marine Barracks. Dolley Madison, the first lady, or perhaps members of the house staff, rescued the Lansdowne Portrait, a full-length painting of George Washington by Gilbert Stuart, as the British approached the Mansion.