Events January–March January 8 – Carolean Death March begins: A catastrophic retreat by a largely-Finnish Swedish-Carolean army under the command of Carl Gustaf Armfeldt across the Tydal mountains in a blizzard kills around 3,700 men and cripples a further 600 for life. January 23 – The Principality of Liechtenstein is created, within the Holy Roman Empire. February 3 (January 23 Old Style) – The Riksdag of the Estates recognizes Ulrika Eleonora's claim to the Swedish throne, after she has agreed to sign a new Swedish constitution. Thus, she is recognized as queen regnant of Sweden. February 20 – The first Treaty of Stockholm is signed. February 28 – Farrukhsiyar, the Mughal Emperor of India since 1713, is deposed by the Sayyid brothers, who install Rafi ud-Darajat in his place. In prison, Farrukhsiyar is strangled by assassins on April 19. March 6 – A serious earthquake (estimated magnitude >7) in El Salvador results in large fractures, liquefaction zones, and a sulphuric gas leak. It destroys houses, churches and monasteries. March 17 – The coronation of Ulrika Eleonora as Queen of Sweden takes place in Stockholm. April–June April 4 – The French army under James FitzJames, 1st Duke of Berwick invades the Basque provinces of Spain, with 20,000 troops crossing into Navarre. April 19 – In Louisiana (New France), Jean-Baptiste Le Moyne, Sieur de Bienville's brother Serigny arrives on a French man-of-war, bringing news that war had been declared between France and Spain (since December 1718). April 25 – Daniel Defoe publishes Robinson Crusoe. April 26 – King Philip V of Spain departs Madrid and leads 15,000 men of the Spanish Army into Navare to fight the French under Berwick. May 14 – In Louisiana (New France), Bienville, from Mobile, captures Pensacola, but Pensacola is later recaptured by the Spanish, and again re-taken by Bienville. May 25 – An earthquake in Turkey damages İzmit and Istanbul, damaging some city walls and ruining mosques and palaces. June 4 – Battle of Ösel Island: A Russian naval force defeats the Swedish fleet. June 18 – Captain John Perry fixes Dagenham Breach. June 10 – Battle of Glen Shiel: British forces defeat the Jacobites and their Spanish allies. June 20 – Battle of Francavilla: The Austrians are defeated by the Spanish. June 30 – French forces under the Duke of Berwick open the Siege of San Sebastian July–September July 11 – Russia's Baltic Sea fleet