May Revolution
The May Revolution was a direct reaction to Spain's Peninsular War. In 1808, King Ferdinand VII of Spain abdicated in favor of Napoleon, who granted the throne to his brother, Joseph Bonaparte. A Supreme Central Junta led resistance to Joseph's government and the French occupation of Spain, but eventually suffered a series of reversals that resulted in the Spanish loss of the northern half of the country. On February 1, 1810, French troops took Seville and gained control of most of Andalusia. The Supreme Junta retreated to Cadiz and dissolved itself, and the Council of Regency of Spain and the Indies replaced it. News of these events arrived in Buenos Aires on May 18, brought by British ships.
Days of May
Although at the time it was claimed that the nation could be mobilised in an hour, commentators disagree on how real the threat of revolution was during the Days of May. Contemporary observers had little doubt: Edward Littleton, then a Whig MP, commented in his diary that the country was "in a state little short of insurrection", while the Anglican clergyman Sydney Smith later described a "hand-shaking, bowel-disturbing passion of fear". As Thomas Creevey observed, this fear was shared by the Queen, whose "fixed impression, is that an English revolution is rapidly approaching, and that her own fate is to be that of Marie Antoinette" Some more modern historians agree: E. P. Thompson wrote that "in the autumn of 1831 and in the 'Days of May' Britain was within an ace of revolution" and Eric Hobsbawm felt that "This period is probably the only one in modern history ... where something not unlike a revolutionary situation might have developed."