During the Second War of Schleswig in 1864, she participated in the naval action against the Austrian-Prussian fleet in the Battle of Heligoland on 9 May 1864. "Jylland" along with "Niels Juel" and "Heimdall" bested two Austrian frigates and three small Prussian gunboats, but was unable to maintain the blockade of the Prussian North Sea ports. "Jylland" sustained considerable damage during the battle.