1) Boat bomb of yore 
A fireship is a small vessel filled with inflammable material, lighted and set adrift among an enemy' s ships in order to set fire to them. Fireships were used during ancient times and successfully employed against the Duke of Parma by the defenders of Antwerp in 1585 and by the British against the Spanish Armada off Gravelines in 1588. Fireships w...Fireship was 17th century British slang for a prostitute with venereal disease.
A ship loaded with flammable materials and explosives and sailed into an enemy port or fleet either already burning or ready to be set alight by its crew (who would then abandon it) in order to collide with and set fire to enemy ships.