For his efforts during the War, France awarded him the Croix de Guerre, and the United States and other allied countries conferred decorations on the Colonel.

[7] Among the principal polo players of his time, "the unanimous opinion was that Mr. Harje's death was due to his refusal to spend money extravagantly on his ponies.

"[17] On 20 October 1897, Harjes was married to heiress Marie Robertina Graves (1873–1905) at "My Fancy", the country home of Malcolm Webster Ford in Babylon on Long Island.

Together, they were the parents of two daughters:[20] After the death of his first wife in Carlsbad, New Mexico from tuberculosis in 1905, he remarried several years later to Frederica Vesta (née Berwind) Gilpin (1884–1954) on 20 February 1911 at the church in the Rue de Berri.

[33] His son Henry sold the Château in 1937 to Baron Jules de Koenigswarter of Paris and his wife, the former Pannonica Rothschild.

[7] An elaborate funeral officiated by The Reverend Frederick W. Beekman at The American Cathedral of the Holy Trinity, of which Harjes had been a vestryman and treasurer for many years, was attended by J.P. Morgan, Dwight Morrow, Benjamin Strong, S. Parker Gilbert, General John J. Pershing and John Grier Hibben.

[41] Ten years after his death, his wife remarried to Seton Porter (in 1936),[42] and lived at 834 Fifth Avenue in New York City.