Gunpowder

Gunpowder was an explosive substance that was used mostly in warfare, such as cannons. This was used in cannons to explosively propel objects forward. It is usually used on Earth in ancient times, and on some primitive planets such as Ribos. (DW:The Ribos Operation)

One of the most notable use of gunpowder was in 1605, where Guy Fawkes and his anti-parliament regime blew up the Houses of Parliament. (MA: The Plotters)

While searching through a manor that was near the vicinity of the Terileptil escape pod, the Doctor and his companions discovered gunpowder, powerpacks and the mark of a high energy weapon. (DW: The Visitation)