The Four Days' Battle was a significant naval engagement during the Second Anglo-Dutch War, taking place from June 1 to June 4, 1666. The battle involved the fleets of the Dutch Republic, commanded by Admiral Michiel de Ruyter, and the English Royal Navy, led by Admiral Robert Holmes. It was one of the longest naval battles in history, characterized by intense fighting and strategic maneuvers. The battle resulted in heavy losses for both sides, with the Dutch ultimately gaining a tactical advantage. Despite the fierce combat, neither fleet achieved a decisive victory, leading to a stalemate. The engagement highlighted the ongoing rivalry between the Dutch and English maritime powers during this period.