On 1 June 1677, Juel defeated the Swedish admiral Erik Carlsson Sjöblad (1647–1725) during the Battle of Møn. On 30 June 1677 he won his greatest victory, in the Battle of Køge Bay southwest of Copenhagen. With 25 ships of the line and 1267 guns, he routed the Swedish admiral Henrik Horn (1618–1693) with 36 ships of the line and 1800 guns. For this great triumph, the reward of superior seamanship and strategy at an early stage of the engagement, Juel's experienced eye told him that the wind in the course of the day would shift from S.W. to W. and he took extraordinary risks accordingly; he was made lieutenant admiral general and a privy councillor. This victory, besides permanently crippling the Swedish navy, gave the Danes the self-confidence to become less dependent on their Dutch allies.