1836, Washington_Irving, Astoria, ch. 26,Others have endeavored to account for these discharges of "mountain artillery" on humbler principles; attributing them . . . to the disengagement of hydrogen, produced by subterraneous beds of coal in a state of ignition.
1895, Francis_Marion_Crawford, Taquisara, ch. 23,There was a quick flash, a disengagement, a feint, a lunge that was like a man's, and as her long left arm shot out like lightning, her foil bent nearly double.