 He was awarded the Grand Cross of the French Legion of Honour on 17 January 1919 and the French Croix de Guerre on 15 February 1919.He was also promoted to full admiral on 21 February 1919, awarded the Grand Cross of the Romanian Order of the Crown on 17 March 1919 and presented with the American Distinguished Service Medal on 16 September 1919.Wemyss was the senior British representative at the signing of the armistice that ended active hostilities in the war.