Cannon

Shrieves manoeuvre a cannon into the catacombs on Ribos. (TV: The Ribos Operation)

A cannon was an artillery piece that used gunpowder to propel objects forward in an offensive manner.

On Ribos, the Shrieves closed of the catacombs by firing a cannon at the entrance. The resultant rock fall killed Sholakh and several of the Graff Vynda-K's Levithian soldiers. (TV: The Ribos Operation)

Ray cannons were utilised during the First Century Universe War. (COMIC: The Time Museum)

Behind the scenes

Willy preparing a cannon. (NOTVALID: Pugwash Ahoy!)

References in invalid sources

When the First Doctor landed his TARDIS on Captain Pugwash's ship, a member of Pugwash's pirate crew, Willy, prepared a cannon. (NOTVALID: Pugwash Ahoy!)