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This article traces the chronological development of the Seven Years War (1756-1763), the conflict sometimes described as the first truly global war, involving all major European powers and spanning multiple continents. For an overview of the conflict, see Seven Years' War. For related administrative consequences, see Proclamation of 1763 - History.

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The roots of the Seven Years War lay in unresolved territorial competition in Europe and North America following the War of the Austrian Succession (1740-1748). The Peace of Aix-la-Chapelle (1748) had restored most conquered territories without resolving the underlying rivalry between Prussia and Austria over the province of Silesia, which Frederick II of Prussia had seized in 1740.

In North America, British and French colonial interests had been in sustained conflict throughout the late seventeenth and early eighteenth centuries. By the early 1750s, the Ohio River valley became a focal point of competition, as both the British colonies and New France sought to control the interior trade networks and westward expansion routes. In 1754, a Virginia colonial militia under the command of Lieutenant Colonel George Washington clashed with French forces at the Battle of Jumonville Glen and subsequently surrendered at Fort Necessity - engagements that formed part of what became known in North America as the French and Indian War.

The diplomatic realignment of 1756, known as the “Diplomatic Revolution,” reshuffled the European alliance system. France, historically allied with Prussia, shifted toward Austria, while Britain allied with Prussia. This reversal was formalized through the Treaty of Westminster (January 1756) between Britain and Prussia and the First Treaty of Versailles (May 1756) between France and Austria.

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Frederick II of Prussia opened hostilities in August 1756 by invading Saxony without a declaration of war, seeking to preempt the Austrian-French coalition he believed was forming against him. Saxony capitulated in October 1756, and its army was forcibly incorporated into Prussian service. The invasion provided Austria and France a casus belli and formally initiated the European war.

In 1757, Prussia faced a coalition that eventually included Austria, France, Russia, Sweden, and most of the Holy Roman Empire. Frederick won a decisive victory at Rossbach in November 1757 against a Franco-Imperial army, and followed it within weeks with an equally significant victory at Leuthen against Austria - both battles demonstrating Prussian tactical flexibility against numerically superior enemies.

In North America, British forces suffered early reverses. General Edward Braddock's 1755 expedition to Fort Duquesne had ended in catastrophic defeat. In 1756-1757, the French commander the Marquis de Montcalm took Fort Oswego and Fort William Henry, extending French dominance in the interior.

In India, the conflict intersected with the contest between the British East India Company and the French Compagnie des Indes for influence over weakening Mughal successor states. The Nawab of Bengal, Siraj ud-Daulah, allied loosely with French interests and in June 1756 captured Calcutta from the British East India Company.

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William Pitt the Elder, appointed Secretary of State in 1757 and effectively directing British war strategy, pursued a policy of subsidizing Prussia heavily while deploying British naval and land power to strike French colonial possessions. Pitt's approach concentrated on North America, the Caribbean, West Africa, and India, treating the European theater largely as a diversion to be funded rather than fought.

In India, Robert Clive retook Calcutta in early 1757 and in June defeated Siraj ud-Daulah at the Battle of Plassey, a victory achieved partly through prior negotiations with the Nawab's general, Mir Jafar. Plassey established British dominance in Bengal and marked a turning point in the East India Company's territorial ambitions on the subcontinent.

In North America, the tide shifted beginning in 1758. British forces under Jeffrey Amherst and James Wolfe captured the fortress of Louisbourg in July 1758, opening the St. Lawrence River to British naval operations. Fort Duquesne was abandoned by the French in November 1758 and renamed Fort Pitt.

The year 1759 is often called the “Year of Victories” (annus mirabilis) in British historiography. British forces took Quebec in September following the Battle of the Plains of Abraham, in which both James Wolfe and Montcalm were killed. Guadeloupe was captured in the Caribbean. At the Battle of Minden in August, a combined Anglo-German force defeated the French in Westphalia. The Battle of Lagos and the Battle of Quiberon Bay neutralized French naval capacity and ended any serious prospect of French invasion of Britain.

In Prussia, Frederick survived severe reverses. Russia occupied East Prussia, and in August 1759 a combined Russian-Austrian force inflicted a major defeat on Frederick at the Battle of Kunersdorf, one of the worst Prussian defeats of the war. Frederick considered abdication but continued fighting.

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By 1760, France had lost most of its North American empire. Montreal fell to British forces in September 1760, completing the conquest of New France. In India, the French position continued to deteriorate; the Battle of Wandiwash in January 1760 effectively ended French military power in the subcontinent.

Spain entered the war in January 1762, signing the Third Family Compact with France in August 1761 and formally joining hostilities at the start of 1762. British forces responded quickly, capturing Havana in August 1762 and Manila in October 1762, seizing Spain's two most valuable colonial ports.

Prussia's survival was significantly aided by what Frederick termed the “Miracle of the House of Brandenburg.” Empress Elizabeth of Russia died in January 1762, and her successor Peter III, an admirer of Frederick, immediately withdrew Russia from the war and returned conquered Prussian territory. Sweden also made peace. These defections restored Frederick's strategic position and allowed him to concentrate against Austria.

Portugal, a British ally, was invaded by Spain in 1762, opening a further theater on the Iberian Peninsula, where British and Portuguese forces successfully resisted.

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The war concluded through two principal treaties negotiated in February 1763.

The Treaty of Paris (10 February 1763) settled colonial and maritime disputes among Britain, France, and Spain. France ceded to Britain all of Canada, the eastern half of the Mississippi valley, most of its Caribbean possessions temporarily or permanently (Grenada, Tobago, Dominica, and St. Vincent), and its Indian enclaves save for two small fishing islands. Spain ceded Florida to Britain in exchange for the return of Havana and Manila. France compensated Spain for Florida losses by transferring Louisiana west of the Mississippi to Spanish sovereignty under the secret Treaty of Fontainebleau (1762).

The Treaty of Hubertusburg (15 February 1763) settled the European war among Prussia, Austria, and Saxony, restoring the prewar status quo. Prussia retained Silesia; Austria received no territory. The settlement confirmed Prussia's status as a major European power alongside Austria.

The Proclamation of 1763, issued by the British Crown in October of that year, reorganized the newly acquired North American territories and established a boundary limiting colonial settlement west of the Appalachians. For differing interpretations of the Proclamation's intent and effects, see Proclamation of 1763 - Administrative Pragmatism Viewpoint and Proclamation of 1763 - Colonial Grievance Viewpoint.

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Some historians argue that the war's North American theater (the French and Indian War) was causally distinct from the European conflict and should be treated as a separate war that was subsequently absorbed into a wider struggle; see seven-years-war-debate-unified-vs-parallel-wars.

The relative weight of Pitt's strategic direction versus naval dominance in explaining British success remains disputed among military historians; see seven-years-war-controversy-british-victory-causes-controversy.

Whether the Battle of Plassey constituted a genuine military engagement or primarily a prearranged political transaction is contested in the historiography of British India; see seven-years-war-controversy-plassey-character-controversy.

The role of the Proclamation of 1763 as a cause of colonial discontent leading to the American Revolution is a matter of ongoing interpretive dispute; see Proclamation of 1763 - Colonial Grievance Viewpoint and Proclamation of 1763 - Administrative Pragmatism Viewpoint.

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1. Fred Anderson, Crucible of War: The Seven Years' War and the Fate of Empire in British North America, 1754-1766 (New York: Alfred A. Knopf, 2000), 5-11. 2. D.B. Horn, “The Diplomatic Revolution,” in The New Cambridge Modern History, vol. 7: The Old Regime, 1713-63, ed. J.O. Lindsay (Cambridge: Cambridge University Press, 1957), 440-464. 3. Christopher Duffy, The Military Life of Frederick the Great (New York: Atheneum, 1986), 113-140. 4. Anderson, Crucible of War, 188-201 (Braddock's defeat); 330-336 (Fort William Henry). 5. P.J. Marshall, Bengal: The British Bridgehead. Eastern India 1740-1828 (Cambridge: Cambridge University Press, 1987), 72-80. 6. Richard Middleton, The Bells of Victory: The Pitt-Newcastle Ministry and the Conduct of the Seven Years' War, 1757-1762 (Cambridge: Cambridge University Press, 1985), 1-30. 7. Anderson, Crucible of War, 344-368 (Louisbourg); 453-469 (Quebec). 8. Duffy, Military Life of Frederick the Great, 175-183 (Kunersdorf). 9. Anderson, Crucible of War, 504-506 (Montreal). 10. Jonathan R. Dull, The French Navy and the Seven Years' War (Lincoln: University of Nebraska Press, 2005), 241-248. 11. Hamish Scott, The Birth of a Great Power System, 1740-1815 (Harlow: Pearson Longman, 2006), 105-110 (Treaty of Paris and Hubertusburg). 12. Jack M. Sosin, Whitehall and the Wilderness: The Middle West in British Colonial Policy, 1760-1775 (Lincoln: University of Nebraska Press, 1961), 51-75 (Proclamation of 1763).