Great idea, Tdora!
From the memoirs by James W. Gerard My Four Years in Germany . He was American Ambassador to Berlin. He was there in the immediate period before the war and as war was declared, in fact all the way almost until the US entered the war. Very interesting, especially as the memoirs were written while the war was still going on. Here is a bit of what he says about Henry.
Eckernfjord is a little fishing and bathing town. Near by is the country residence of Prince Henry, a rather modest house, built in brick in English Elizabethan style. The wife of Prince Henry was a Princess of Hesse-Darmstadt and is the sister of the Czarina of Russia. We had tea with Prince and Princess Henry, their family, the Duke of Sonderburg-Glücksburg and several others of his family. The billiard room of the house is decorated with the large original caricatures made by McCutcheon of the Prince's stay in America.
Prince and Princess Henry came out to dine on the Utowana, and Armour and the Prince went ashore to attend another Bierabend, but I dodged the smoke and beer and remained on board. Before he left the yacht, I had a talk with Prince Henry. He seemed most exercised over the dislike of the Germans by all other peoples and asked me why I thought it existed. I politely told him that I thought it existed because of the success which the Germans had had in all fields of endeavour, particularly in manufacturing and commerce. He said, with great truth, that he believed a great deal of it came from the bad manners of the travelling Germans.
Prince Henry is an able and reasonable man with a most delightful manner. He speaks English with a perfect English accent, and I think would be far happier as an English country gentleman than as the Grand Admiral of the German Baltic Fleet. He has been devoted to automobiling and has greatly encouraged that industry in Germany. The Automobile Club of Berlin is his particular pet."
Interesting the comment about him being happier as an English country gentleman--the same has been said of NII and even Kaiser Wilhelm.