Demi-cannon
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A demi-cannon or half-cannon was a 17th Century naval gun which fired a 32-pound solid shot. A full cannon fired a 42-pound shot. 42-pounders were discontinued as they were seen as too unwieldy in the 18th Century. The lower tier of 17th Century English ships of the line were usually equipped with demi-cannons. Ships featuring demi-cannons included HMS Sovereign of the Seas, HMS Resolution and HMS James, which fought in the Anglo-Dutch naval wars.