Like most periodic eras the definition is inexact but close enough to serve as a general description. The age of sail runs roughly from the Battle of Lepanto in 1571, the last significant engagement in which oar-propelled galleys played a major role, to the Battle of Hampton Roads in 1862, in which the steam-powered ironclad CSS Virginia destroyed the sailing ships USS Cumberland and USS Congress, culminating with the advance of steam power, rendering sail power in warfare obsolete.