1weltkrieg

en.wikipedia.org/wiki/Prince_Joachim_of_Prussia Prince Joachim Franz Humbert of Prussia (17 December 1890 – 18 July 1920) was the youngest son of Wilhelm II, German Emperor, by his first wife, Augusta Viktoria of Schleswig-Holstein.

en.wikipedia.org/wiki/Prince_Oskar_of_Prussia
See
and

Fascinating portrait. The jaunty informal angle of the hat is telling. One moment he seems a lovable rogue and the next moment he seems sly, teasing and perhaps sometimes a little bit nasty. (I say this entirely from the portrait. I don't know anything about him, otherwise.)

Edward Norton

I thought Edward Norton, too.

amazing portrait!

Acording to www.akpool.co.uk/postcards/24155901-postcard-gotha-eisene... this statue was erected Sept 26, 1915. According to en.wikipedia.org/wiki/Etrich_Taube The Taube was a "pre-World War I monoplane aircraft. It was the first mass-produced military plane in Germany." www.pictorialgems.com/1916-Gotha-Taube-Memorial-To-German... shows this picture printed in the Illustrated War News of February 16, 1916

This plane with the birdlike tail (the name translates to English as "dove") was reportedly responsible for bombings in Paris in October, 1914.
query.nytimes.com/mem/archive-free/pdf?res=9A07E4DA1438E0...
A Bain photo of the damage:

It looks like the sort of memorial you could pay to drive a nail into. See the leading edge of the wing, and the engine.

Seth Gaines That's correct, the memorial is on a list of "Kriegsnagelungen" (war nailings) (with the same postcard as in swanq's comment), see www.munzel-everling.de/download/Kriegsnagelungen_August_2....

Another example of such a memorial was the "Eiserne Hindenburg" in Berlin Tiergarten

see comments there

""Kriegsnagelungen". I never knew of these, thanks. I wonder if this monument still exists? I can't find any trace of it.