Gardiner, History of England, vols. iv. and v. (1901); J. L. Motley, Life and Death of John of Barneveld (ed. 1904; vol. ii) Further reading Ernst von Mansfeld - notification (also in English) concerning the latest biography about the mercenary leader (published in September 2010) Book review and summary (in English) of the German biography mentioned before External links Ernst von Mansfeld 1580s births 1626 deaths Ernst German mercenaries Counts of Germany Military personnel of the Thirty Years' War People of the Anglo-Spanish War (1625–1630)