the Austrian Succession: French forces defeat the Austrians in the Battle of Sahay. June 7 – Christian Goldbach first describes Goldbach's conjecture ("Every even number is the sum of two primes") in a letter to fellow mathematician Leonhard Euler. June 11 – Peace of Breslau: Austria cedes Silesia to Prussia. June 20 – Izmir, formerly the ancient Greek city of Smyrna, is destroyed by fire. July–September July 7 – War of Jenkins' Ear: Battle of Bloody Marsh – British troops repel those of Spain (under Montiano), in the Province of Georgia. July 14 – William Pulteney is created 1st Earl of Bath in Great Britain. August 17 Accompanied by 10 French Army observers, Choctaw Indians from the French Louisiana territory cross the Tombigbee River and raid Chickasaw Indian towns in Georgia. Over three days, the attackers lose 50 men, the Chickasaw defenders about 25. For permitting the attack, the French Louisiana governor, the Sieur de Bienville, is summoned back to Paris. Irish author and poet Dean Jonathan Swift is declared by a court to be "of unsound mind and memory" and confined to home treatment for the remaining three years of his life. August 19 A British fleet led by Commodore William Martin enters the harbor of Naples with three warships, two frigates, and four bomb vessels, and sends a message giving the King Charles VII of Naples (the future King Charles III of Spain) 30 minutes to agree to withdraw Neapolitan troops from the Spanish Army. Don Carlos agrees and ends the threat of a Spanish foothold in Italy. Voltaire's controversial play Fanatacism, or Mahomet the Prophet is first performed, in Paris, to a theatre audience filled with French nobility. August 20 – The Swedish-Russian War effectively ends as 17,000 Swedish troops surrender in Finland at Helsingfors (modern-day Helsinki). August 27 – George Anson, captain of HMS Centurion, arrives with his seriously ill crew at the island of Tinian (now U.S. territory as one of the Northern Mariana Islands and saves his mission. September 5 – The 46 survivors of Russia's Great Northern Expedition return to Petropavlovsk after having been shipwrecked on an island in the Bering Strait ten months earlier. They had completed the building of a new ship from the wreckage of the St Pyotr on August 21. September 16 – Construction starts on the Foundling Hospital in London. October–December October 5 Pedro Cebrian y Agustin, Count