He was on guard at a cabin door when he fired his musket into a box of gunpowder , which blew up .
A marine caused a major incident on 10 August 1798 on Terpsichore .
marine was on guard at a cabin door when marine fired marine 's musket into a box of gunpowder , which blew up .
A marine caused a major incident on 10 August 1798 on Terpsichore .