Cannons existed since the First Age of Darkness, but they were always installed on ships and could be used to blast away foes. Only beginning from the time of the Shadowlords was it possible to use cannons on land as well.
According to Vetron's Guide to Weapons and Armour, a cannon has a damage power of 90.
- Successfully destroying water-borne enemies with a ship's cannons in both Ultima I and Ultima II would automatically earn gold; not so in later installments.
- In Ultima V, a cannon can be used to blast open the door blocking the way to the Magic Carpet.
- Through Ultima V, both ship- and land-mounted cannons had unlimited shots -- even when not placed next to a supply of cannonballs.
- A barge cannon, loaded with Andrew Carnegie's custom-made steel cannonballs, is an essential component of finishing Martian Dreams.