License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Stefano della Bella. Plate 5: a procession of horsemen crossing a river, a tree at center, from "Troops, cannons, and attacks on towns" (Dessins de quelques conduites de troupes, canons, et ataques de villes), ca. 1640. The Metropolitan Museum of Art.