Franz Joseph I of Austria
If Greater Germany was to prevail, the crown would necessarily have to go to Franz Joseph, who had no desire to cede it in the first place to anyone else. On the other hand, if the idea of a smaller Germany won out, the German crown could of course not possibly go the Emperor of Austria, but would naturally be offered to the head of the largest and most powerful German state outside of Austria—the King of Prussia. The contest between the two ideas, quickly developed into a contest between Austria and Prussia. After Prussia decisively won the Seven Weeks War, this question was solved; Austria lost no territories as long as they remained out of German affairs.
Military history of Germany
During the Seven Years' War, Prussia fought on the side of Britain against Russia, Sweden, Austria, France, and Saxony. Frederick II of Prussia first invaded Saxony and defeated a Saxon army at Lobositz. Frederick would then invade Bohemia, the Prussians besieged Prague, but they were defeated at Kolin. Since Prussia looked vulnerable, the Austrians and French invaded Prussian lands. However, the French were defeated at Rossbach and the Austrians at Leuthen. In 1758, Frederick the Great tried to invade Austria, but he failed. Now, the Russians tried to defeat the Prussians, but the Prussians earned a pyrrhic victory at the Zorndorf. The Swedes, however, fought the Prussians to a draw at Tornow. However, Austria gained a victory against the Prussian main army at Hochkirch. In 1759, the Prussians lost at Kunersdorf to the combined Russians and Austrians. Berlin itself was taken for a few days in 1762, but its army could not be destroyed. However, the great alliance against Prussia broke up when Elizabeth of Russia died. It was from her death that a pro-Prussian ruler, Peter III would sue for peace. It was thanks to this "miracle of the House of Brandenburg" and to the unshakable will of Frederick that Prussia survived.