 Two earlier and rarer examples – having more in common with American ironclads – concerned the Peruvian Navy wooden gunboat , which was converted into a Confederate-style casemate ironclad in 1864 and used in a very similar role during the Chincha Islands War.The other example concerned the Royal Dutch Navy ship-of-the-line , whose conversion into an "armoured steam battery" – completed in 1865 – was ordered immediately after the Battle of Hampton Roads, much like the "Merrimack" was into "Virginia" and suffering from the same defects.Still, all admiralties concluded that it was an evolutionary dead end and that the revolving gun turret was the way to go – the validity of the conclusion being amply hammered home when the revolutionary entered service, rendering everything that went before obsolete overnight.