 Complete the following phrase:  In the War of the Austrian Succession, he took part in the storming of Prague in 1742, and was made a brigadier. In 1744 and 1745 he saw further service on the Rhine, and he succeeded his father as 2nd duc de Broglie on the old dukes death in 1745. He was made a Maréchal de Camp, and he subsequently served with Marshal de Saxe in the Low Countries, and was present at Roucoux, Val and 