It has occasionally been used for unrelated vessels with similar military functions as galley but which were not Mediterranean in origin, such as medieval Scandinavian longships, 16th-century Acehnese ghalis and 18th-century North American gunboats.
For naval combat, galleys were equipped with various weapons: rams and occasionally catapults until late antiquity, Greek fire during the Early Middle Ages, and cannons from the 15th century.
Initially, gun galleys posed a serious threat to sailing warships, but were gradually made obsolete by the development of full-rigged ships with superior broadside armament.
River boats plied the waterways of ancient Egypt during the Old Kingdom (2700–2200 BC) and seagoing galley-like vessels were recorded bringing back luxuries from across the Red Sea in the reign of pharaoh Hatshepsut.
As an example of the speed and reliability, during an instance of the famous "Carthago delenda est" speech, Cato the Elder demonstrated the close proximity of the Roman arch enemy Carthage by displaying a fresh fig to his audience that he claimed had been picked in North Africa only three days past.
This attracted a business of carrying rich pilgrims to the Holy Land, a trip that could be accomplished in as little 29 days on the route Venice–Jaffa, despite landfalls for rest and watering, or to shelter from rough weather.
Fleets with large galleys were put in action in conflicts such as the Punic Wars (246–146 BC) between the Roman Republic and Carthage, which included massive naval battles with hundreds of vessels and tens of thousands of soldiers, seamen, and rowers.
The Romans maintained numerous bases around the empire: along the rivers of Central Europe, chains of forts along the northern European coasts and the British Isles, Mesopotamia, and North Africa, including Trabzon, Vienna, Belgrade, Dover, Seleucia, and Alexandria.
[44] In the eastern Mediterranean, the Byzantine Empire struggled with the incursion from invading Muslim Arabs from the 7th century, leading to fierce competition, a buildup of fleet, and war galleys of increasing size.
In the 13th century the Iberian Crown of Aragon built several fleet of galleys with high castles, manned with Catalan crossbowmen, and regularly defeated numerically superior Angevin forces.
[58] From around 1450, three major naval powers established a dominance over different parts of the Mediterranean, using galleys as their primary weapons at sea: the Ottomans in the east, Venice in the center and Habsburg Spain in the west.
Spain sent galley squadrons to the Netherlands during the later stages of the Eighty Years' War which successfully operated against Dutch forces in the enclosed, shallow coastal waters.
Around 2,000 galley rowers under the command of Squadron General Diego de Medrano were on board ships of the famous 1588 Spanish Armada, though few of these actually made it to the battle itself.
[67] Even though the carracks themselves were soon surpassed by other types of sailing vessels, their greater range, great size, and high superstructures, armed with numerous wrought iron guns easily outmatched the short-ranged, low-freeboard Turkish galleys.
[71] Some of the larger vessels were very large with heavier armament than standard Mediterranean galleys, with raised platforms for infantry and some with stern structures similar in height to that of contemporary galleons.
[d] They could effectively fight other galleys, attack sailing ships in calm weather or in unfavorable winds (or deny them action if needed) and act as floating siege batteries.
By 1650, war galleys were used primarily in the struggles between Venice and the Ottoman Empire for strategic island and coastal trading bases and until the 1720s by both France and Spain for largely amphibious and cruising operations or in combination with heavy sailing ships in a major battle, where they played specialized roles.
[83] No large all-galley battles were fought after the gigantic clash at Lepanto in 1571, and galleys were mostly used as cruisers or for supporting sailing warships as a rearguard in fleet actions, similar to the duties performed by frigates outside the Mediterranean.
In the first half of the 18th century, the other major naval powers in the Mediterranean Sea, the Order of Saint John based in Malta, and of the Papal States in central Italy, cut down drastically on their galley forces.
The response came in the building of a considerable fleet of oared vessels, including hybrids with a complete three-masted rig, as well as a Mediterranean-style galleys (that were even attempted to be manned with convicts and slaves).
[90] While galleys were too vulnerable to be used in large numbers in the open waters of the Atlantic, they were well-suited for use in much of the Baltic Sea by Denmark-Norway, Sweden, Russia, and some of the Central European powers with ports on the southern coast.
One was the open sea, suitable for large sailing fleets; the other was the coastal areas and especially the chain of small islands and archipelagos that ran almost uninterrupted from Stockholm to the Gulf of Finland.
Naval conflict grew more intense and extensive, and by 100 BC galleys with four, five or six rows of oarsmen were commonplace and carried large complements of soldiers and catapults.
The huge polyremes disappeared and the fleet were equipped primarily with triremes and liburnians, compact biremes with 25 pairs of oars that were well suited for patrol duty and chasing down raiders and pirates.
[119] The accepted view is that the main developments which differentiated the early dromons from the liburnians, and that henceforth characterized Mediterranean galleys, were the adoption of a full deck, the abandonment of rams on the bow in favor of an above-water spur, and the gradual introduction of lateen sails.
A rectangular telaro, a projecting outrigger, was added to support the oars and the rowers' benches were laid out in a diagonal herringbone pattern angled aft with a central gangway (corsia) running along the centerline.
Practical experiments with the full-scale trireme reconstruction Olympias has shown that there was insufficient space to perform a sliding stroke movement, and moving or rolling seats would have been highly impractical to construct with ancient technology.
[156] Contrary to the popular image of rowers chained to the oars, conveyed by movies such as Ben Hur, there is no evidence that ancient navies made regular use of condemned criminals or slaves as oarsmen, with the possible exception of Ptolemaic Egypt.
The Egyptian victory was commemorated on the mortuary temple of Ramesses III at Medinet Habu and shows intense close quarters fighting and the use of grapnels thrown into the rigging to capsize ships and throwing its crew into the sea.
If ramming was not possible or successful, the on-board complement of soldiers would attempt to board and capture the enemy vessel by securing it with grappling irons, accompanied by missile fire with arrows or javelins.