"Arminius", "Cyclop", and "Tiger" sent men ashore at Brunshausen, where they spiked the guns of an abandoned coastal artillery battery. Werner then detached "Tiger" and "Wolf" to bombard the batteries at the mouth of the Elbe, while "Cyclop" was sent to attack the battery at Grauerort. "Arminius" entered the Elbe on 17 June, but heavy storms prevented her from intercepting a Norddeutscher Lloyd steamship that was carrying the Hannoverian gold reserves to Britain. The Prussian army, supported by Werner's flotilla, had succeeded in capturing all of the major fortifications guarding the Elbe, Weser, and Ems by 22 June, and other naval forces from the Baltic and Mediterranean Sea had arrived to further strengthen the Prussian fleet. "Arminius" and the other vessels thereafter patrolled the coast of Ostfriesland to show the flag. By the end of the month, the Prussian army had decisively defeated the Austrians at Königgrätz and ended the war. Following the signing of the peace treaty that formally ended the conflict, Werner's flotilla was disbanded on 23 August and "Arminius" returned to Kiel.