On Oct. 1, 1939, Winston Churchill described Russia as “a riddle wrapped in a mystery inside an enigma” during a radio address on the invasion of Poland by Nazi Germany and the Soviet Union.

Ten years ago

The Israeli army completed its withdrawal from Lebanon, clearing the way for a U.N. peacekeeping force. Brazil’s leftist President Luiz Inacio Lula da Silva fell short of the votes he needed to win a second term outright and was forced into a runoff, which he won by a landslide. Tiger Woods won the American Express Championship in Chandler’s Cross, England. (It was his eighth victory of the year, making Woods the first player in PGA Tour history to win at least eight times in three seasons.)

Five years ago

More than 700 Occupy Wall Street protesters were arrested after they swarmed the Brooklyn Bridge and shut down a lane of traffic for several hours in a tense confrontation with police. Campaigning began in Tunisia for the first elections born of the revolts that swept the Middle East.

One year ago

A gunman opened fire at Umpqua Community College in Roseburg, Oregon, killing nine people and then himself. Officials in Michigan declared a public health emergency over the city of Flint’s water in response to tests that showed children with elevated levels of lead. Oregon marijuana shops began selling for the first time to recreational users.

— By The Associated Press