Modernism and camouflage would seem to be unlikely allies. One advances and the other retreats. One rebels and resists; the other lurks undercover. But during World War I, a group of renegade camoufleurs forged an uneasy truce between modernism’s flash and camouflage’s muted secrets. Their sources were extraordinary and eclectic. Drawing inspiration from animal behavior, avant-garde design, and women’s fashion, the camoufleur—and, as I argue, the camoufleuse—worked to reimagine visibility and warfare in modern terms.