 Complete the following phrase:  The fourth son of Ferdid Albert II, Duke of Brunswick-Lüneburg, Ferdid joined the Prussian army as a colonel in 1740. He was present in the battles of Mollwitz and Chotusitz. After Margrave Wilhelm of Brandenburg-Schwedt was killed at Prague in 1744, Ferdid received command of Frederick the Greats Leibgarde battalion, and at the Battle of Soor 1745 he distinguished himself greatly, especially in the assault of a steep hill, that incidentally was defended by his older brother duke Louis Ernest of Brunswick-Lüneburg. He took part in the Second Silesian War before leading part of the invasion of Saxony and Bohemia in 1756 during the Seven Years War. He participated in the 