the.com/ironclad

A wooden navy's worst nightmare, wrapped in armor and steaming toward obsolescence.

means So firmly secured or guaranteed that it cannot be broken, doubted, or wriggled out of — as in an ironclad alibi or contract.

from A literal compound of 'iron' and 'clad' (the past participle of 'clothe,' from Old English 'clāthian'), so it means 'clothed in iron.' It first described 19th-century warships sheathed in iron plating, and the figurative sense — anything armored against challenge — followed naturally from a thing you simply couldn't pierce.

first clash
Monitor versus Merrimack ended in a 1862 draw
instant obsolescence
One battle made every wooden warship a relic
word origin
Now means contracts you legally cannot wriggle out of
heavy problem
All that armor made early ironclads barely seaworthy
french first
La Gloire beat everyone to it in 1859
for instance

uss monitor — first ironclad warship used in combat by us navy, 1862 battle of hampton roads

hms warrior — first iron-hulled armored warship built by britain, launched 1860

css virginia — confederate ironclad that fought uss monitor at hampton roads, march 1862

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