Background
In the wake of the Diplomatic Revolution of 1756 and the subsequent First Treaty of Versailles, France agreed to a defensive pact with its new ally, Austria, if either were attacked by Great Britain or Prussia. [1]
On 29 August 1756, Prussia launched a pre-emptive invasion of the Austrian ally of Saxony, starting the Third Silesian War, and therefore drawing France into the new conflict.
The invasion led to the signing of the Second Treaty of Versailles between Austria and France on 1 May 1757. In the treaty, France promised to strengthen its commitment to their existing alliance by raising an army in Flanders to invade Prussia from the west. However, France had already been assembling troops in Flanders as early as March to invade the British ally of Hanover. [2]
With the French invasion of Hanover looming, Frederick II of Prussia ordered for the Prussian fortress of Wesel to be evacuated in early 1757, and its garrison sent to join the assembling Hanoverian Army of Observation, leaving the garrison of Geldern on the western extremity of the Kingdom of Prussia isolated.
The garrison of Geldern exchanged fire with French hussars on 25 March, and would later fall under a full siege when the French surrounded the town on 14 April. [4]
1757 (MDCCLVII) was a common year starting on Saturday of the Gregorian calendar and a common year starting on Wednesday of the Julian calendar, the 1757th year of the Common Era (CE) and Anno Domini (AD) designations, the 757th year of the 2nd millennium, the 57th year of the 18th century, and the 8th year of the 1750s decade. As of the start of 1757, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.
The Pomeranian War was a theatre of the Seven Years' War. The term is used to describe the fighting between Sweden and Prussia between 1757 and 1762 in Swedish Pomerania, Prussian Pomerania, northern Brandenburg and eastern Mecklenburg-Schwerin.
The Treaty of Hubertusburg was signed on 15 February 1763 at Hubertusburg Castle by Prussia, Austria and Saxony to end the Third Silesian War. Together with the Treaty of Paris, signed five days earlier, it marked the end of the Seven Years' War. The treaty ended the continental conflict with no significant changes in prewar borders. Austria and Saxony renounced all claims to the Silesian territories ceded to Prussia in the 1742 Treaty of Berlin and the 1745 Treaty of Dresden. Prussia clearly stood among the ranks of the European great powers, while the treaty enhanced the rivalry with Austria.
The Battle of Gross-Jägersdorf was a victory for the Russian force under Field Marshal Stepan Fyodorovich Apraksin over a smaller Prussian force commanded by Field Marshal Hans von Lehwaldt, during the Seven Years' War. This was the first battle in which Russia engaged during the Seven Years' War.
The Battle of Breslau was fought on 22 November 1757 in Breslau during the Third Silesian War. A Prussian army of 28,000 men fought an Austrian army of 60,000 men. The Prussians held off the Austrian attack, losing 6,000 men to the Austrians' 5,000 men. But one day later the Prussians beat a retreat. Breslau's garrison surrendered on 25 November 1757.
The Battle of Zorndorf, during the Seven Years' War, was fought on 25 August 1758 between Russian troops commanded by Count William Fermor and a Prussian army commanded by King Frederick the Great. The battle was tactically inconclusive, with both armies holding their ground and claiming victory. The site of the battle was the Prussian village of Zorndorf. During the battle, Frederick famously took a regimental standard and led an attack himself, rallying his troops.
The Diplomatic Revolution of 1756 was the reversal of longstanding alliances in Europe between the War of the Austrian Succession and the Seven Years' War. Austria went from an ally of Britain to an ally of France; the Dutch Republic, a long-standing British ally, became more anti-British and took a neutral stance while Prussia became an ally of Britain. The most influential diplomat involved was an Austrian statesman, Wenzel Anton von Kaunitz.
The Seven Years' War (1756–1763) was a global conflict involving most of the European great powers, fought primarily in Europe and the Americas. One of the opposing alliances was led by Great Britain, primarily supported by Prussia. The other alliance was led by France, backed by Spain, Saxony, Sweden, and Russia. Related conflicts include the 1754 to 1763 French and Indian War, and 1762 to 1763 Anglo-Spanish War.
The siege of Fort St Philip, also known as the siege of Minorca, took place from 20 April to 29 June 1756 during the Seven Years' War. Ceded to Great Britain in 1714 by Spain following the War of the Spanish Succession, its capture by France threatened the British naval position in the Western Mediterranean and it was returned after the Treaty of Paris (1763).
The Anglo-Austrian Alliance connected the Kingdom of Great Britain and the Habsburg monarchy during the first half of the 18th century. It was largely the work of the British Whig statesman Thomas Pelham-Holles, 1st Duke of Newcastle, who considered an alliance with Austria crucial to prevent the further expansion of French power.
The Third Silesian War was a war between Prussia and Austria that lasted from 1756 to 1763 and confirmed Prussia's control of the region of Silesia. The war was fought mainly in Silesia, Bohemia and Upper Saxony and formed one theatre of the Seven Years' War. It was the last of three Silesian Wars fought between Frederick the Great's Prussia and Maria Theresa's Austria in the mid-18th century, all three of which ended in Prussian control of Silesia.
The Convention of Klosterzeven was a convention signed on 10 September 1757 at Klosterzeven between France and the Electorate of Hanover during the Seven Years' War that led to Hanover's withdrawal from the war and partial occupation by French forces. It came in the wake of the Battle of Hastenbeck on 26 July in which Hanover had suffered a devastating defeat. Following the battle the Army of Observation had retreated northwards until it had reached Stade.
Great Britain was one of the major participants in the Seven Years' War, which in fact lasted nine years, between 1754 and 1763. British involvement in the conflict began in 1754 in what became known as the French and Indian War. However the warfare in the European theater involving countries other than Britain and France commenced in 1756. Britain emerged from the war as the world's leading colonial power, having gained all of New France in North America, ending France's role as a colonial power there. Following Spain's entry in the war in alliance with France in the third Family Compact, Britain captured the major Spanish ports of Havana, Cuba and Manila, in the Philippines in 1762, and agreed to return them in exchange for Spanish Florida. The Treaty of Paris in 1763 formally ended the conflict and Britain established itself as the world's pre-eminent naval power.
The Anglo-Prussian Alliance was a military alliance created by the Westminster Convention between Great Britain and Prussia that lasted formally between 1756 and 1762, during the Seven Years' War. The alliance allowed Britain to concentrate most of its efforts against the colonial possessions of the French-led coalition while Prussia bore the brunt of the fighting in Europe. The alliance ended in the final months of the conflict, but strong ties remained between both kingdoms.
The Franco-Austrian Alliance was a diplomatic and military alliance between France and Austria that was first established in 1756 after the First Treaty of Versailles. It lasted for much of the remainder of the century until it was abandoned during the French Revolution.
The Treaty of Versailles, also known as the First Treaty of Versailles, was a diplomatic agreement between France and Austria. It was signed in 1756 at the Palace of Versailles in France. There were four treaties signed on this Agreement.
The Treaty of Versailles was a diplomatic agreement signed between Austria and France at the Palace of Versailles on 1 May 1757 during the Seven Years' War. It expanded on the 1756 First Treaty of Versailles, which had established the Franco-Austrian Alliance. It is thus commonly known as the Second Treaty of Versailles.
The Invasion of Hanover took place in 1757 during the Seven Years' War when a French army under Louis Charles César Le Tellier, duc d'Estrées advanced into the Electorate of Hanover and neighbouring German states, following the Battle of Hastenbeck. French forces overran most of Hanover. This action forced the Hanoverian Army of Observation, intended to defend the Electorate, to Stade on the North Sea coast. At the Convention of Klosterzeven the Duke of Cumberland agreed to disband his army and acknowledge the French occupation of the Electorate.
The Anglo-Prussian Convention was agreed on 11 April 1758 between Great Britain and the Kingdom of Prussia and formalised the alliance between them that had effectively existed since the Convention of Westminster in 1756.
The siege of Breslau was a siege in the Third Silesian War that began on 7 December 1757 and ended on 19 December 1757. After the defeat at Leuthen, the Austrians withdrew into Breslau. The combined Austro-French garrison of approximately 17,000 men, commanded by Lieutenant General Field Marshal Soloman Sprecher von Bernegg, faced a Prussian army commanded by Frederick the Great.
France 
Prussia