Two-decker
File:HMS asia (1811).jpg
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Template:HMS, British 74-gun warship
File:The Moonlight Battle- the Battle off Cape St Vincent, 16 January 1780 RMG BHC0430.jpg
The Moonlight Battle by Dominic Serres, with a British two-decker in the foreground.
A two-decker is a sail warship which carried her guns on two fully armed decks.<ref>Template:Cite book</ref> Usually additional guns were carried on the upper works (forecastle and quarterdeck), but this was not a continuous battery and thus not counted as a full gun deck.
Two-deckers ranged all the way from the small 40-gun Fifth rate up to 80- or even 90-gun ships of the line, with the third-rate of seventy-four guns, or "seventy-four", being the archetype.