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The Old Cannon is a weapon emplacement featured on Operation Mortar in the Naval Strike expansion pack. The Flag B Fort features four cannons all around the base. They have a low rate of fire but deal high damage to any target struck (usually instant vehicle-disable for light-vehicles and choppers, and instant kills against infantry). It is worth noting that the cannon's projectiles seem to have an extreme drop-off, making long-range engagements difficult.
Obtaining a kill with a cannon will award players with the "No Parley" achievement/trophy.