Fighting ships before the gun
The earliest warships were not purpose-built fighting machines so much as fast, oared vessels with soldiers aboard. By the first millennium BC, Mediterranean powers were building long, narrow galleys driven by banks of rowers. Their signature weapon was the bronze-clad ram at the waterline, intended to hole an enemy hull. The best-known type is the trireme, with rowers on three levels, and the details of its layout are still debated; the surviving evidence is discussed under trireme design.
A galley’s strength was manoeuvrability that did not depend on the wind. Its weakness was endurance. A crew of rowers needs food and water in quantities that limit how far a ship can go, and low hulls cope poorly with rough seas. That is why galley fleets tended to hug coasts and fight near their bases. The Battle of Salamis in 480 BC, in which Greek triremes faced a larger Persian force in confined waters, is the classic example of a galley fight shaped by geography.
Later fleets added more rowers or bigger ships, and Hellenistic navies built some very large oared vessels. Rome, which had little naval tradition at first, shifted the emphasis from ramming to boarding, treating a sea fight as a land fight on a moving platform. The Byzantine Empire inherited the galley tradition and refined it in the dromon, which sometimes carried a fire-throwing device.
Galleys to galleons
Oared warships did not vanish when sail and gunpowder arrived. In the Mediterranean, galleys remained useful for centuries, and the Battle of Lepanto in 1571 is often described as the last great clash of galley fleets. Even there, the Christian side included heavily armed galleasses, a sign of the direction things were taking.
The real change came in the Atlantic. Ships built for rough open water, with sturdy hulls and several masts, could carry guns in numbers that a galley could not. By the early sixteenth century, gun ports cut in the hull sides allowed heavy cannon to be mounted low and fired in a broadside. Henry VIII’s Mary Rose, lost in 1545, is one of the best-known ships of this transition, and its remains are discussed in the account of the Mary Rose wreck. Rather than closing to board, ships could now damage each other at a distance.
By the time of the Spanish Armada in 1588, both sides relied on large sailing ships, although the details of the fighting were shaped as much by weather and logistics as by gunnery. Over the following century, navies settled on standard designs and began to think about formation as well as individual ships.
The age of the line and the frigate
From the mid seventeenth century, major navies, particularly during the Anglo-Dutch wars, developed the line of battle: ships sailing in a column so that each could fire its broadside while avoiding friendly fire. This produced the specialised ship of the line, a large, multi-decked vessel built to take its place in that column. It was supported by lighter vessels. The frigate scouted, carried messages, escorted merchant ships and raided enemy trade. Both types are covered in their own articles, but the pairing explains how sailing navies worked: heavy ships for decisive battle, lighter ones for everything else.
Sailing warships reached their peak around the Napoleonic wars. Battles such as Trafalgar in 1805 showed that discipline, gunnery and aggressive tactics counted for as much as the ships themselves. Behind the fleets lay large shore establishments, such as the royal dockyards in Britain, where timber, rope, iron and guns were assembled on an industrial scale. Crewing these ships was a separate challenge, and in Britain it led to practices such as press gangs.
Steam, iron and armour
Steam engines were first used in warships in auxiliary roles, since early paddle wheels were vulnerable to enemy shot and left little room for guns. The screw propeller solved much of this, and by the 1850s steam-and-sail battleships were common. Shell guns, which fired explosive rather than solid shot, made wooden hulls more dangerous to sit in, and navies responded with iron plate. The transition is traced in the steamship era and in the broader story of iron shipbuilding.
The first ironclads, including France’s Gloire (launched 1859) and Britain’s Warrior (launched 1860), made wooden battle fleets obsolete within a generation. The clash of the American Civil War ironclads in 1862 became the best-known engagement of the type, though it is better understood as a symbol than as a decisive battle. By the late nineteenth century, warships were steel-hulled, powered entirely by steam, and armed with a few heavy guns in turrets.
Torpedoes, dreadnoughts and submarines
New weapons arrived that did not depend on size. The self-propelled torpedo, developed in the second half of the nineteenth century, allowed a small, cheap craft to threaten a battleship. Fast torpedo boats, and the destroyers built to hunt them, followed. The submarine, a long-standing idea that became practical around the turn of the twentieth century, carried the same threat below the surface; see early submarines and military submarines for that thread.
At the same time, the battleship reached its apogee. HMS Dreadnought, completed in 1906, combined a uniform main battery of heavy guns with steam turbine propulsion, and her name became shorthand for a whole generation of ships. Naval rivalry before 1914, culminating in the Jutland fleet action in 1916, was built around these vessels, even though the clash was less decisive than many had expected.
Carriers and the modern fleet
Aircraft were first carried by warships as scouts, then as strike weapons. During the 1920s and 1930s several navies converted or built carriers, and during the Second World War the aircraft carrier replaced the battleship as the most important surface ship. Battles in the Pacific, including the Midway carrier battle in 1942, were fought largely by aircraft, with opposing ships often beyond each other’s sight. Meanwhile, convoy escorts and anti-submarine ships fought a very different war in the Atlantic convoy battle.
After 1945, nuclear propulsion, guided missiles and radar-guided systems changed fleets again. Carriers remain the centrepiece of the largest navies, while submarines, destroyers and frigates fill the supporting and strategic roles. The pattern that runs through three thousand years is that no single ship type stays dominant for long. Each is overtaken when a new weapon, power source or material makes its main strength less useful.