Linny, it was Bay Ronald’s son, Dark Ronald, who was brought to Germany. But, if I read correctly, Bay Ronald did spend time in France, so perhaps another base for his blood to come through.
For anyone still interested in the background, at least in Holsteiner breeding, here are some articles that might be of interest:
You have to scroll quite a ways down on this page to find how Dark Ronald was acquired, and this author says von Oettingen influenced the work of Tesio:
http://classicchampionthoroughbreds.blogspot.com/2012/07/book-reviews-burchard-von-oettingen.html
[I]After the establishment of the Royal Stud, select English Thoroughbred and Arabian stallions were purchased and added to the breed. One of von Oettingen’s crowning achievements for the improvement of the Royal Stud was the purchase in 1913 of the English-bred Thoroughbred Dark Ronald for £25,000 (about $40,000). It was, definitely, money well spent as Dark Ronald became a foundation stallion of the Royal Stud and one of the most influential sires in the history of Germany.
Dark Ronald sired the German Derby winner Herold, and his sire line produced other notable Thoroughbreds such as Alchimist, Birkhahn, Surumu, and Acatenan*go, all of whom were classic champions and important sires. In all, the sire line of Dark Ronald has produced 25 German Derby winners, and his influence has even recently been seen in the United States—as Acatenango is the broodmare sire of Animal Kingdom, winner of the 2011 Kentucky Derby and Eclipse Champion Three-Year-Old Male.
In addition to becoming a tremendous influence on the German Thoroughbred, the sire line of Dark Ronald also is a powerful worldwide influence on the European Warmblood. The highly regarded Moorlands-Totilas, viewed by many as one of the greatest horses in the history of dressage and a triple gold medalist at the 2010 World Equestrian Games in Lexington, Kentucky, is a direct sire-line descendent of Dark Ronald (fig. 4.6). In the show jumping world, Dark Ronald is a direct sire-line ancestor of the deceased jumping champion and influential improvement sire Cor de la Bryére and his sons Caletto I, Caletto II, Caletto III, Calypso I, Calypso II, Calypso III, Calypso IV, Corrado I, Corde-Star, and Cordalmé Z.
[/I]
This article about Bay Ronald, although the author says Hampton was a hurdler, that’s not really correct. They did try him on hurdles, but briefly, it seems:
http://www.horseplanet.net/Sport-Horse.asp?id=14026
William Micklem on the five TB gods of WB breeding:
http://www.horseplay.ie/news/riding-resource/william-micklem-even-mark-todd-can-be-led-astray-part-3.asp
And this series with interviews from Holsteiner breeders. There’s one where the problem with Northern Dancer lines is discussed, as being Quarter Horse type and not what they need:
http://www.horsemagazine.com/thm/2010/09/the-holsteiner-part-1/
http://www.horsemagazine.com/thm/2010/09/the-holsteiner-part-2/
http://www.horsemagazine.com/thm/2010/09/the-holsteiner-part-3/
There was an article, quite a while ago, by CM Frank, I think, on Bay Ronald, and I’m not sure the second site listed didn’t come from part of that, but I’m not sure.
I hope people enjoy these histories and view points. I by no means want to imply that Bay Ronald was the only TB influence. Just that German breeders generally know who and what they want woven into their horses pedigrees and have proven it works.