An ironclad is a strong ship. 

Long ago, most big ships were made of wood. 


For a long time, most big warships were made of wood. 

An ironclad had three main parts. First, it had a metal skin to stop shells. Second, it used steam power to move. Third, it carried heavy guns. Steam power was a big deal. Before steam, ships needed wind to move. Steam engines let ships move even when there was no wind. 
France built the first ocean-going ironclad. It was named Gloire. It was launched in 1859. Britain soon built its own ironclads, too. One famous British ship was the HMS Warrior. 
An ironclad was a special kind of warship built between 1859 and the early 1890s. 

To be a true ironclad, a ship needed three main things. First, it needed a metal-skinned hull to stop shells. Second, it needed steam propulsion, which is a way to move using engines. Third, it needed heavy guns that could fire explosive shells. 
History shows a race to build these powerful vessels. The French Navy launched the first ocean-going ironclad, named Gloire, in November 1859. 

Many different countries began building these ships during this time. By 1862, France and Britain each had sixteen ironclads ready or being built. 
Ironclads changed the way people thought about sea travel and war. They were designed for many jobs, like defending coasts or traveling the high seas. As technology improved, the ships changed too. Better steam engines and stronger steel made shipbuilding easier. 
An ironclad was a specialized type of steam-propelled warship. These vessels were protected by armor made of iron or steel. This era of naval design lasted from 1859 to the early 1890s. 
To be classified as a true ironclad, a ship required three specific characteristics. First, it needed a metal-skinned hull to provide protection. Second, it required steam propulsion to move through the water. Third, it needed a main armament of guns capable of firing explosive shells. 
Steam propulsion was the first major change to traditional warships. In the 18th century, fleets relied on ships of the line and frigates. These ships used sails and depended entirely on the wind. The introduction of the screw propeller in the 1840s changed everything. 
Explosive shells provided the second major technological shift. In the 1820s and 1830s, naval guns became much heavier. Ships moved from 18-pounder guns to 32-pounders or even 68-pounders. French General Henri-Joseph Paixhans developed the first shell guns. These guns fired explosive shells that could destroy wooden ships. 
Iron armor was the third essential component for protection. The use of wrought iron for hulls began as early as the 1830s. The first iron-hulled gunboat was the Nemesis in 1839. Later, the 1842 steam frigate Guadalupe was built with a metal hull for the Mexican Navy. 
France and Britain engaged in a fierce competition to build the best ironclads. France launched the first ocean-going ironclad, the Gloire, in 1859. 

Ironclads saw their first major combat during the American Civil War in 1862. 

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