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