 Complete the following phrase:  Saxony joined Austria in the Second Silesian War, which erupted after Prussia proclaimed to keep Charles VII as Holy Roman Emperor and invaded Bohemia on 15 August 1744. The true cause behind the invasion was Fredericks personal expansionist ideas and goals. On 8 January 1745, the Treaty of Warsaw united Great Britain, the Habsburg Monarchy, the Dutch Republic and Saxony into what became known as the Quadruple Alliance, which was aimed at securing the Austrian throne for Maria Theresa. Soon-after Charles VII died of gout in Munich, which weakened the Prussians. However, Prussia still maintained military superiority; the successful battles of 