After Napoleon's abdication following the March 1814 Battle of Paris, the British began to shift soldiers to North America. Under General George Izard and General Jacob Brown, the U.S. launched another invasion of Canada in mid-1814. Despite an American victory at the Battle of Chippawa, the invasion stalled once again. Meanwhile, the British increased the size and intensity of their raids against the Atlantic coast. General William H. Winder attempted to bring together a concentrated force to guard against a potential attack on Washington or Baltimore, but his orders were countermanded by Secretary of War Armstrong. The British landed a large force off the Chesapeake Bay in August 1814, and the British army approached Washington on August 24. An American force was routed at the Battle of Bladensburg, and British forces set fire to the federal buildings of Washington. Dolley Madison rescued White House valuables and documents shortly before the British burned the White House. The British army next moved on Baltimore, but the British called off the raid after the U.S. repelled a naval attack on Fort McHenry. Madison returned to Washington before the end of August, and the main British force departed from the region in September. The British attempted to launch an invasion from Canada, but the U.S. victory at the September 1814 Battle of Plattsburgh ended British hopes of conquering New York.