The action of 16 October 1799 was a minor naval engagement during the French Revolutionary Wars between a squadron of British Royal Navy frigates and two frigates of the Spanish Navy close to the Spanish naval port of Vigo in Galicia. The Spanish ships were a treasure convoy, carrying silver specie and luxury trade goods across the Atlantic Ocean from the colonies of New Spain to Spain. Sighted by British frigate HMS Naiad enforcing the blockade of Vigo late on the 15 October, the Spanish ships were in the last stages of their journey. Turning to flee from Naiad, the Spanish soon found themselves surrounded as more British frigates closed in.