The final upshot of this Silesian argument was the Seven Years' War. Maria Theresa made friends with the mistress of Louis XV, and so secured a French alliance. Frederick offended the Empress of Russia by his witty tongue, and she also joined in the "ladies' war" against him. Saxony, the nearest state to Prussia, was ever on the side of the strongest. So here was the European coalition hurled against Frederick in his turn. He proved the ablest general of his age, one of the master minds of military skill. For seven years he withstood all his enemies, Austria and Russia mainly, for Saxony he soon conquered, and France showed no great military powers--disgraced herself if further disgrace were possible to her condition. Over the military details of the contest we need not pause.[15] Prussia had always been regarded as one of the lesser European states, Austria and France as the chief powers. Russia now proved herself of equal weight with the greatest, so that even the genius of Frederick began to fail against the enormous odds which crushed him down. His land was laid waste, his capital seized by a sudden attack and held for ransom. He was saved by the death of the Russian Empress; her son and successor, an admirer of Frederick, promptly changed sides in the war. By degrees everyone abandoned it but Maria Theresa; and she, finding her single strength insufficient against Prussia, was compelled to yield at last. Frederick kept his dear-bought desert of Silesia. This Seven Years' War caused what that of the Austrian Succession had attempted, a complete redistribution of the balance of European power, England, Russia, and Prussia rising to at least equality with Austria and France. Even before the opening of the formal war France and England had been engaged in a colonial strife, which had caused England to declare herself Frederick's ally; and, while in Europe the grapple between England and France did not assume serious proportions, it was of enormous consequence to their colonies in India and America. In India both countries had trading-stations, but the French were popular with the natives and the English were not. The weakness of the native support was not realized by either party. The conquests of Nadir Shah were scarcely known to them; the name of the Great Mogul at Delhi was one of vagueness and mysterious power; it seemed to the French that with Indian aid they could easily drive the English into the sea; and the attempt was made. It must have been successful but for Clive. That remarkable young warrior rose from his subordinate desk, laid aside his clerkly pen, and gathering a little band of fighters round him, defeated both French and natives in the remarkable siege of Arcot. Then came the hideous tale of the "black hole of Calcutta," and Clive achieved revenge and completed his work of conquest at Plassey (1757).[16]