Battle of Gross-Jägersdorf  The Battle of Gross-Jägersdorf (30 August 1757) 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. Despite the tactical success, supply problems made a successful advance further into East Prussia impractical. Apraksin decided not to take Königsberg and ordered a withdrawal soon after the battle. Suspecting collusion between Apraksin and Chancellor Alexey Bestuzhev-Ryumin, who had opposed the invasion, Elizabeth of Russia removed Apraksin from command, ordered Bestuzhev-Ryumin to face trial for treason, and appointed William Fermor as the head of the army. Femor led the army back into East Prussia in the following year. Although the Seven Years' War was a global conflict, it took a specific intensity 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. 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 between Britain and France 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 Brunswick-Lüneburg 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.