They returned the insignia of the Order of the Garter of the recently deceased Frederick I, Duke of Württemberg and visited Scotland where they were hosted by Andrew Melville of Garvock.
[5] Buwinckhausen believed that the Protestant Union couldn't defeat the Habsburgs who occupied Julich on its own, and thought that it was necessary to acquire aid from surrounding nations.
He also believed that Wolfgang Wilhelm (who jointly claimed the Duchies of Julich-Cleves-Berg alongside Johann Sigismund of Brandenburg) was an unreliable ally that might switch to support the Habsburgs.
[9] In London in 1620 negotiating with Christopher von Dohna on behalf of Frederick V of the Palatinate and the Princes of the Union, Buwinckhausen refused a gift of valuable silver plate from James VI and I, on the grounds that he was not an ambassador.
[10] He was also given a gold chain with a portrait medal of the king, provided by a London goldsmith John Acton.