Arthur Rackham - Illustration for "Till Eulenspiegel"

I am an admirer of Arthur Rackham and am often to be found scouring places for his work. It's great fun to get lost in the online galleries of museums and dream of one day seeing the works in person. I stumble across this beauty of his in the Metropolitan's gallery. I have never read the story it's from, but now I must see if I can get my hands on it. How terrifying and haunting the figures are. I wonder if the fact that it was done right in the middle of WWI had anything to do with the darkness and fear in this painting.

Arthur Rackham,  Illustration for "Till Eulenspiegel", watercolour, pen, ink, and guache on paper, 1916