Ironclads.
Boats covered in iron are commonly referred to as ironclads.
These ships were called ironclads.
The South's first ironclad warship was the CSS Virginia. This vessel was constructed from a sunken Union ship the USS Merrimack. The Confederates retooled the ship, added much armor and became the first ironclad warship of the US Civil War.
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Longships
trireme
A Trireme
covered or protected with iron.Noun A 19th-century warship with armor plating.
A warship built of iron or steel, or plated (over it's wooden hull) with steel/iron plates.
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Saxophone