Although the Seven Years' War was a global conflict, it was particularly intense in the European theater based on the recently concluded
War of the Austrian Succession (1740–1748). The 1748
Treaty of Aix-la-Chapelle gave
Frederick II of Prussia, known as Frederick the Great, the prosperous province of
Silesia as a consequence of the
First and
Second Silesian Wars. Empress
Maria Theresa of Austria had signed the treaty to gain time to rebuild her military forces and forge new alliances; she was intent upon regaining ascendancy in the
Holy Roman Empire as well as the Silesian province. In 1754, escalating tensions with Britain in
North America offered France an opportunity to break the British dominance of Atlantic trade. Seeing the opportunity to regain her lost territories and to limit Prussia's growing power, Austria put aside the old
rivalry with France to form a new coalition. Faced with this turn of events, Britain aligned herself with the
Kingdom of Prussia; this alliance drew in not only the British king's territories held in
personal union, including Hanover but also those of his relatives in the
Electorate of Hanover and the
Landgraviate of Hesse-Kassel. This series of political maneuvers became known as the
Diplomatic Revolution. At the outset of the war, Frederick had one of the finest armies in Europe: his troops—any company—could fire at least four volleys a minute, and some of them could fire five. By the end of 1757, the course of the war had gone well for Prussia, and poorly for Austria. Prussia had achieved spectacular victories at
Rossbach and
Leuthen, and reconquered parts of Silesia that had fallen back to Austria. The Prussians then pressed south into Austrian
Moravia. In April 1758, Prussia and Britain concluded the
Anglo-Prussian Convention in which the British committed to pay Frederick an
annual subsidy of £670,000. Britain also dispatched 7,000–9,000 troops to reinforce the army of Frederick's brother-in-law, the
Duke Ferdinand of Brunswick-Wolfenbüttel. Ferdinand evicted the French from Hanover and
Westphalia and re-captured the port of
Emden in March 1758; he crossed the Rhine, causing general alarm in France. Despite Ferdinand's victory over the French at the
Battle of Krefeld and the brief occupation of
Düsseldorf, successful maneuvering of larger French forces required him to withdraw across the Rhine. After the
Battle of Kolín, having pushed the Prussians out of
Bohemia in the summer of 1757, and the cleverly waged campaign in the autumn that saw
Lieutenant-General the Duke of Bevern's Prussians defeated at the
Battle of Breslau (22 November 1757), Empress
Maria Theresa of Austria believed her fortunes were taking a turn for the better; however, the situation soon changed when Frederick defeated, first, the French at
Rossbach and, then, the Austrians at
Leuthen. In August 1758, Austria's ally Russia invaded East Prussia. 42,590 troops under
William Fermor advanced within of
Berlin, and were poised to join the
Austrians under
Field Marshal Daun. King Frederick understood that the joining of his enemies would spell the fall of Berlin and, deciding to forestall their plans, moved to the Russian rear. Fermor, who was then besieging
Küstrin, learned about this maneuver from a
Cossack sortie. He lifted the siege and occupied a position at Zorndorf, northeast of Küstrin. At the
Battle of Tornow a month later, a Swedish army repulsed the Prussian army but did not move on Berlin. By late summer, fighting had reached a draw. None of Prussia's enemies seemed willing to take the decisive steps to pursue Frederick into Prussia's heartland. While Ferdinand kept the French occupied in the Rhineland, Prussia had to contend with Sweden, Russia, and Austria. There remained a possibility that Prussia could lose Silesia to Austria, Pomerania to Sweden, Magdeburg to Saxony, and East Prussia to Poland-Lithuania or Russia: for Prussia, this represented an entirely nightmarish scenario. By 1758, Frederick was concerned by the Russian advance from the east and marched to counter it. East of the
Oder river in Brandenburg-
Neumark, a Prussian army of 36,000 men fought a Russian army of 42,590 at Zorndorf on 25 August 1758. ==Terrain==