"Prince Georg Friedrich of Waldeck (31 January 1620 – 19 November 1692) was a German and Dutch Field Marshal and, for the last three years of his life, Grand Master of the Order of Saint John (Bailiwick of Brandenburg).
In 1641, Waldeck entered the service of the States-General of the Netherlands; later in 1651, in the service of Brandenburg, he reached the highest rank as minister. He changed the foreign policy completely by abandoning the alliance with the Emperor and trying to forge a coalition with the Protestant princes.
In 1656 he arranged a coalition with Sweden, and commanded the cavalry in the Battle of Warsaw (1656) against Poland. He was dismissed in 1658 when Frederick William, Elector of Brandenburg made peace with Poland." - (en.wikipedia.org 31.01.2020)
en