Battle of Copenhagen (1801)

In the Battle of Copenhagen, also known as the First Battle of Copenhagen to distinguish it from the Second Battle of Copenhagen in 1807, a British naval fleet defeated a smaller force of the Royal Dano-Norwegian Navy anchored near Copenhagen on 2 April 1801. The battle came about over British fears that the powerful Danish fleet would ally with France, and a breakdown in diplomatic communications on both sides.

Source: Wikipedia — Battle of Copenhagen (1801) (CC BY-SA 4.0)