The aim of Carteret and of the Court of Vienna was now not only to set up the Pragmatic Sanction, but to undo the French encroachments of 1736. Naples and Sicily were to be taken back from their Spanish king, Elsass and Lorraine from France; and the imperial dignity was to be restored to the Austrian House. To carry out these schemes an Austrian army drove the Emperor from Bavaria in the spring of 1743; while George the Second, who warmly supported Carteret's policy, put himself at the head of a force of 40,000 men, the bulk of whom were English and Hanoverians, and marched from the Netherlands to the Main. His advance was checked and finally turned into a retreat by the Duc de Noailles, who appeared with a superior army on the south bank of the river, and finally throwing 31,000 men across it threatened to compel the king to surrender. In the battle of Dettingen which followed, however, on the 27th June 1743, not only was the allied army saved from destruction by the impetuosity of the French horse and the dogged obstinacy with which the English held their ground, but their opponents were forced to recross the Main. Small as was the victory, it produced amazing results. The French evacuated Germany. The English and Austrian armies appeared on the Rhine; and a league between England, Prussia, and the Queen of Hungary, seemed all that was needed to secure the results already gained. [Sidenote: Fall of Carteret.] But the prospect of peace was overthrown by the ambition of the house of Austria. In the spring of 1744 an Austrian army marched upon Naples, with the purpose of transferring it after its conquest to the Bavarian Emperor, whose hereditary dominions in Bavaria were to pass in return to Maria Theresa. Its march at once forced the Prussian king into a fresh attitude of hostility. If Frederick had withdrawn from the war on the cession of Silesia, he was resolute to take up arms again rather than suffer so great an aggrandizement of the House of Austria in Germany. His sudden alliance with France failed at first to change the course of the war; for though he was successful in seizing Prague and drawing the Austrian army from the Rhine, Frederick was driven from Bohemia, while the death of the Emperor forced Bavaria to lay down its arms and to ally itself with Maria Theresa. So high were the Queen's hopes at this moment that she formed a secret alliance with Russia for the division of the Prussian monarchy. But in 1745 the tide turned, and the fatal results of Carteret's weakness in assenting to a change in the character of the struggle which transformed it from a war of defence into one of attack became manifest. The young French king, Lewis the Fifteenth, himself led an army into the Netherlands; and the refusal of Holland to act against him left their defence wholly in the hands of England. The general anger at this widening of the war proved fatal to Carteret, or as he now became, Earl Granville.