Naval cannon

The boat cannon in action.

The boat cannon is a new ballistic gameplay sequence appearing in Assassin's Creed Brotherhood. It is a device, probably built by Leonardo da Vinci, similar to a regular cannon which projects fire balls in different directions in order to cause wide ranged damage. The cannon is placed on a small boat so that it can be driven throughout Tiber River among other boats, and can be used to destroy Templar battleships. It appears to be able to launch multiple projections at once.