Four Days' Battle and St James's Day Battle, 1666

The Four Days' Battle (1-4 June 1666) was a major Dutch victory during the Second Anglo-Dutch War that saw a badly outnumbered British fleet suffer heavy casualties in one of the largest and longest battles fought during the age of sail.
The St. James's Day Battle (25-26 July 1666) was a British victory during the Second Anglo-Dutch War that proved that the Royal Navy had not been too badly damaged during the Dutch victory in the Four Days' Battle at the start of June.