Degenerate Art,” an exhibition at the Musée Picasso in Paris on the Nazis’ persecution of modern artists, is about culture ...

This underground art is relatively unknown beyond a circle of World War I scholars and enthusiasts, as well as village mayors and landowners, many of whom Gusky has spent years getting to know.

A poster portraying the “Second Patriotic War” as World War I was known in Russia. (Napoleon’s 1812 invasion was Russia’s first “patriotic war.”) Germany’s Kaiser Wilhelm II ...