Battle of Heligoland (1864)
…in the North Sea, Tegetthoff joined a Prussian aviso and a pair of gunboats. To oppose him, Suenson had available the steam frigates Niels Juel and Jylland and the corvette Hejmdal. On the morning of 9 May, the two squadrons encountered each other off the island of Heligoland, then controlled by neutral…