was intended to ride over an enemy ship's oars, breaking them and rendering it helpless against missile fire and boarding actions. Standardization From the 12th century, the design of war galleys evolved into the form that would remain largely the same until the building of the last war galleys in the late 18th century. The length to breadth-ratio was a minimum of 8:1. A rectangular telaro, an outrigger, was added to support the oars and the rowers' benches were laid out in a diagonal herringbone pattern angled aft on either side of a central gangway, or corsia. It was based on the form of the galea, the smaller Byzantine galleys, and would be known mostly by the Italian term galea sottile (literally "slender galley"). A second, smaller mast was added sometime in the 13th century and the number of rowers rose from two to three rowers per bench as a standard from the late 13th to the early 14th century. The galee sottili would make up the bulk the main war fleets of every major naval power in the Mediterranean, assisted by the smaller single-masted galiotte, as well as the Christian and Muslim corsairs fleets. Ottoman galleys were very similar in design, though in general smaller, faster under sail, but slower under oars. The standard size of the galley remained stable from the 14th until the early 16th century, when the introduction of naval artillery began to have effects on design and tactics. The traditional two side rudders were complemented with a stern rudder sometime after c. 1400 and eventually the side rudders disappeared altogether. It was also during the 15th century that large artillery pieces were first mounted on galleys. Burgundian records from the mid-15th century describe galleys with some form of guns, but do not specify the size. The first conclusive evidence of a large cannon mounted on a galley comes from a woodcut of a Venetian galley in 1486. The first guns were fixed directly on timbers in the bow and aimed directly forward, a placement that would remain largely unchanged until the galley disappeared from active service in the 19th century. With the introduction of guns in the bows of galleys, a permanent wooden structure called rambade (French: rambade; Italian: rambata; Spanish: arrumbada) was introduced. The rambade became standard on virtually all galleys in the early 16th century. There were some variations in the navies of