Were turtle ships true ironclads?

Were sixteenth-century turtle ships really ironclads?

Possibly, but the evidence cannot establish whether their roofs carried armor plates or chiefly iron spikes over thick timber.

Thick wooden construction and substantial iron fittings are well within the surviving descriptions, but those descriptions do not conclusively establish a continuous armored skin. If iron plates covered the vessel, a broad definition of ironclad could apply; if the iron consisted mainly of spikes and fittings, the label is misleading. Japanese sources receive unusual weight because Korean political factions repeatedly destroyed records. Japanese experiments with iron plate from 1593 may have answered Korean cannon fire, but they do not prove that turtle ships themselves carried continuous plating. The answer preserves that evidentiary distinction rather than treating a popular reconstruction as settled fact.