Boone leaned forward to right a twisted martingale, and when he straightened up he answered slowly: "I suppose any prominent man in a hard fight may be in-some danger, but he doesn't seem to take it very seriously."
"The Tempering"
Charles Neville Buck
Besides a halter, a single rein, attached to rather a clumsy bit, is the usual trooper's equipment: to this is attached the inevitable ring-martingale, without which few Federal cavaliers, civil or military, would consider themselves safe.
"Border and Bastille"
George A. Lawrence
I took all the gold I found, and playing the martingale, and doubling my stakes continuously, I won every day during the remainder of the carnival.
"The Memoires of Casanova, Complete The Rare Unabridged London Edition Of 1894, plus An Unpublished Chapter of History, By Arthur Symons"
Jacques Casanova de Seingalt