A drawing of a crowd of Israelites, some mounted upon camels, watching in astonishment as Moses bends and gestures with his staff in order to bring back the waters which will drown the Egyptians. Part of Pharaoh's army is amassed on the left, led by a mounted soldier in close pursuit. By reinforcing the forms with dark contours, Castiglione probably intended the composition to read almost as a relief, in the manner of ancient sarcophagi.