 Hake was appointed to a post in the War Ministry in 1809, and
served as Minister of War from 17 June 1810 until August 1813 when he was replaced by Boyen (during which time he attracted much attention by his efficient preparations for war).Subsequently, commanded a brigade in the Prussian IV Corps (Bülow's) with rank of major-general, and played a distinguished part in the Battle of Waterloo.In 1819 Hake was again appointed Minister of War.