On This Day: September 6

Battle of the Frigidus: Roman Emperor Theodosius I defeats and kills Eugenius the usurper. His Frankish magister militum Arbogast escapes but commits suicide two days later.

Christopher Columbus sails from La Gomera in the Canary Islands, his final port of call before crossing the Atlantic Ocean for the first time.

The Victoria returns to Sanlúcar de Barrameda in Spain, the only surviving ship of Ferdinand Magellan's expedition and the first ship to circumnavigate the world.

The Pilgrims sail from Plymouth, England on the Mayflower to settle in North America. (Old Style date; September 16 per New Style date.)

Puritans settle Salem which became part of Massachusetts Bay Colony.

Thirty Years' War: In the Battle of Nördlingen, the Catholic Imperial army defeats Swedish and German Protestant forces.

England's Long Parliament suppresses all stage plays in theatres.

The Battle of Groton Heights takes place, resulting in a British victory.

British scientist John Dalton begins using symbols to represent the atoms of different elements.

Henry David Thoreau leaves Walden Pond and moves in with Ralph Waldo Emerson and his family in Concord, Massachusetts.