Hakkapeliitta (Finnish pl. hakkapeliitat) is a historiographical term used for a Finnish light cavalryman in the service of King Gustavus Adolphus of Sweden during the Thirty Years' War (1618 to 1648). Hakkapeliitta is a 19th century Finnish modification of a contemporary name given by foreigners in the Holy Roman Empire and variously spelled as Hackapelit, Hackapelite, Hackapell, Haccapelit, or Haccapelite. These terms were based on a Finnish battle cry hakkaa päälle (English: Hack on them; Swedish: hacka på), commonly translated as "Cut them down!"