Origin: 1615–25; < French dragon, special use of dragondragon, applied first to a pistol hammer (so named because of its shape), then to the firearm, then to the troops so armed
1622, from Fr. dragon "carbine, musket," because the guns the soldiers carried "breathed fire" like a dragon. The verb is from 1689, lit. "to force by the agency of dragoons" (which were used by the Fr. kings to persecute Protestants).