Here's an incident that occurred in 1656, from the Memoirs of James II:
An entire Regiment of horse, consisting of Six score, going from Douay to the Enemie's Camp, all of them Officers as well as Souldiers having behind them a bagg of powder, besides about fourscore horses laden with hand grenades, which were led by Countrymen on foot, had been all blown up, but by what accident, none of those who were brought prisoners into the Camp could tell. Indeed it was a very dismall object, to behold a great number of poor men, who were brought into our Camp with their faces disfigur'd and their bodies burnt by powder, so that few of them recover'd, their Companions Having been all kill'd outright.
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I happen 'd since, when I was in Flanders, to talke with a Lieutenant of horse who was the only man that could give an account, how that accident befell them; for seeing his face had been burnt, I casually ask'd him how he came by that misfortune? He answer'd me, that it was by the blowing up of powder at such a time near Arras; and upon my examining him concerning the particulars of it, he told me, That happening to be in the Rear of the whole Regiment, he saw one of the Troopers with a pipe of tobacco lighted in his mouth; wherupon he rode up to him, and taking it gently from him, threw it away after which he beat him with his sword: The Soldier being drunke, pull'd out his pistol, and presented it to his breast; upon which the Lieutenant threw himself from his horse apprehending what might happen, and the Trooper at the same instant firing at him, it lighted on the bag behind the sd Lieutenant's horse, which taking fire, blew it up, and so, from one successively to the other who was next, it spred through the whole Regiment: he being on the ground escap'd best cheape, having only his face, his hands, and some parts of his body scorched.