Oxenstiern, the great chancellor of Sweden, saw that the only hope of eventual success lay in engaging France in the struggle, and he and the Duke of Weimar went to Paris and pointed out to Richelieu that unless France intervened, Austria must become the master of all Germany, and as the ally of Spain would have it in her power to completely dominate France. Richelieu perceived the opportunity, made a treaty with the Swedes and Weimar, and engaged to grant large subsidies to the former, and to send an army to cooperate with the latter. Then began the second period of this long and terrible struggle, France now taking the place that Sweden had hitherto occupied, and bearing the brunt of the conflict. She emerged triumphant with her territories largely increased, while Austria was crushed and humiliated, and Spain was dethroned from her position as the dominating power of Europe. The success of France was greatly due to the fact that her armies were led by two of the greatest military geniuses of all times, viz., Conde and Turenne, men of very different types, but equally great as commanders, and equally at the time of which we are speaking devoted to the cause of France