A cheap weapon against an expensive ship
Through most of the nineteenth century, the biggest warships were also the most secure. A battleship carried thick armour and heavy guns, and few things could reach it effectively. That changed with the self-propelled torpedo, developed in the 1860s and associated with the engineer Robert Whitehead, working in Fiume (now Rijeka) with an idea brought to him by an Austrian naval officer. Early torpedoes were slow and short-ranged, but they struck below the waterline, where armour offered little help.
A torpedo needed a launching platform, and the platform could be small. A fast, lightly built boat carrying a few torpedoes could, in theory, sink a ship worth many times its cost. Navies began building torpedo boats in the 1870s and 1880s, and by the 1880s the French and others were looking closely at how these craft might be used against a stronger fleet. France’s interest, in particular, was linked to the idea that a weaker navy could use many small boats to challenge a stronger one. This line of thinking is often associated with a school of French naval thought called the Jeune Ecole, though its influence is debated.
Why the threat worried fleet commanders
For a battleship, the danger was less that torpedo boats would win a fleet action and more that they could attack at night, in harbour, or in narrow waters where big guns had little time to react. Hitting a moving target at night with early torpedoes was hard, but the possibility still mattered. Defences included searchlights, small quick-firing guns, and nets rigged around anchored ships.
Commanders also faced a practical problem. Torpedo boats were small, had limited range, and were poor in heavy seas. But if a fleet had to operate near an enemy coast, it could expect to encounter them. Something was needed to protect the battle fleet at close quarters.
The birth of the destroyer
The answer was a larger, faster vessel with enough guns to destroy torpedo boats and enough torpedo tubes to threaten bigger ships itself. Britain’s early examples, such as HMS Havock and HMS Hornet of the early 1890s, are among the first ships generally described as torpedo boat destroyers. They were built to be faster than the boats they hunted, and a long, low hull with powerful machinery became their common feature. The full name was soon shortened to “destroyer”.
Because a destroyer could also carry torpedoes, it did not remain purely defensive. Within a few years it was both a hunter of torpedo boats and a torpedo carrier in its own right, and in many navies the older torpedo boat declined as destroyers took over its work. Steam turbines, adopted in the experimental destroyer HMS Turbine at the end of the 1890s, gave a further jump in speed.
From fleet screen to general-purpose escort
By the time of the Russo-Japanese War in 1904 and 1905, destroyers and torpedo boats were part of regular fleet operations, including night attacks on ships at anchor, and the Tsushima naval battle saw them used to harry a damaged Russian fleet. Around the same time, the dreadnought era made large fleets more dependent on a screen of fast ships. In the First World War, destroyers fought in fleet engagements such as the Jutland fleet action, but they also took on a role their designers had not planned: protecting merchant shipping against submarines.
The submarine was a new torpedo threat, and the destroyer’s speed and ability to drop depth charges made it the obvious counter. That wartime experience carried into the Second World War, when destroyers and their smaller cousins escorted convoys in the Atlantic convoy battle, as well as screening carriers and battleships. Some navies also built vessels called destroyer escorts or similar types, smaller and cheaper than fleet destroyers, to meet the demand for convoy protection.
The destroyer after 1945
After the Second World War, the destroyer kept growing. Guided missiles replaced many of its guns and torpedoes, and radar and sonar became central to its work. Modern destroyers are often as large as the cruisers of earlier eras, and the distinction between the two types has blurred. Their original definition, a ship built to destroy torpedo boats, no longer describes them in any meaningful way.
What has stayed constant is the logic that created them. A fleet needs ships able to find and counter threats that the main units cannot handle alone. The torpedo boat was the first such threat to prompt a new class; the submarine, the aircraft and the guided missile each prompted further changes in the destroyer’s equipment. For the broader context of how these shifts fit together, see the history of warships from steam to steel in the wider cluster.