1828, Frederic Shoberl, , Part 4, Chapter XII: Amusements and Exercises,The king’s cavalry are also trained to an exercise called the keykaj, which consists in turning about on the saddle at full speed and firing a carbine backward. This they learn from their childhood, and it gives them great confidence and dexterity on horseback. It is probably a remnant of the old Parthian custom so frequently alluded to in ancient authors; with this difference, that fire-arms are now used instead of bows and arrows.
Delivered as if in retreat. (An allusion to the Parthian battle tactic of firing arrows backwards from horseback while apparently in retreat.)A Parthian shot.
1863, Theodore Winthrop, , Chapter I: Off,Finally the blue dells and gorges of a wooded mountain, for two hours our landmark, rose between us and the sun. But the sun’s Parthian arrows gave him a splendid triumph, more signal for its evanescence. A storm was inevitable, and sunset prepared a reconciling pageant.
1887, Arthur Conan Doyle, , Part 1, Chapter 3: The Lauriston Garden Mystery,"Poison," said Sherlock Holmes curtly, and strode off. "One other thing, Lestrade," he added, turning round at the door: "‘Rache,’ is the German for ‘revenge’; so don't lose your time looking for Miss Rachel."With which Parthian shot he walked away, leaving the two rivals open-mouthed behind him.