Rear-Admiral Sir Thomas Hardy was a Royal Navy officer of the late 17th and early 18th centuries. Having joined the navy sometime before 1688, Hardy's career was supported by Captain George Churchill, whom he served as first lieutenant during the Battle of Barfleur in 1692. Promoted to captain in 1693, Hardy served in the Channel Islands and off the coast of England until 1702 when he was given command of HMS Pembroke off the coast of Spain. He fought at the Battle of Cádiz, and subsequently discovered the location of the Franco-Spanish fleet through the intervention of his chaplain, which resulted in the Battle of Vigo Bay. Hardy was knighted for his services.

The Battle of Vigo Bay, also known as the Battle of Rande, was a naval engagement fought on 23 October 1702 during the opening years of the War of the Spanish Succession. The engagement followed an Anglo-Dutch attempt to capture the Spanish port of Cádiz in September in an effort to secure a naval base in the Iberian Peninsula. From this station the Allies had hoped to conduct operations in the western Mediterranean Sea, particularly against the French at Toulon. The amphibious assault, however, had proved a disaster, but as Admiral George Rooke retreated home in early October, he received news that the Spanish treasure fleet from America, laden with silver and merchandise, had entered Vigo Bay in northern Spain. Philips van Almonde convinced Rooke to attack the treasure ships, despite the lateness of the year and the fact that the vessels were protected by French ships-of-the-line.