January 6– The Siege of Salses ends almost six months after it had started on June 9, 1639, with the French defenders surrendering to the Spanish attackers.
June 13– The eruption of the Mount Komagatake volcano takes place in Japan. Although the eruption causes few direct injuries, the heavy ashfall poisons local crops and causes the Kan'ei Great Famine that causes more than 50,000 deaths from starvation.
July–September
July 9–John Punch, a servant of Virginia planterHugh Gwyn, is sentenced to a life of servitude after attempting to escape, making him the "first official slave in the English colonies" [2]
September 20– The Siege of Turin ends in Italy after almost four months with a victory by French and Piedmontese after having started on May 22, and the city is recaptured from Spain.
The end of the Iberian Union of Spain and Portugal begins, as a revolution organized by the nobility and bourgeoisie causes John IV of Portugal to be acclaimed as king, thus ending 60 years of personal union of the crowns of Portugal and Spain, and the rule of the House of Habsburg (also called the Philippine Dynasty). The Spanish Habsburgs do not recognize Portugal's new dynasty, the House of Braganza, until the end of the Portuguese Restoration War in 1668.