EuroGraphics Emanuel Leutze - Washington Crossing the Delaware 1000-Piece Puzzle. Washington Crossing the Delaware is the best known painting from Emanuel Leutze, a German born artist. After moving to the US as a child, the main theme of his works would be described as works of patriotic emotionalism. Box size: 10" x 14" x 2. 37". Finished Size: 19. 25" x 26. 5".