Henning von Holtzendorff
Henning von Holtzendorff (1853–1919) was a German admiral during World War I who became famous for his memo to Kaiser Wilhelm II about unrestricted submarine warfare against the United Kingdom. He was made a Grand Admiral in 1918.
Among the claims in his memo were that this kind of warfare would starve the British into submission within five months and that the Americans were too disorganized to help.