In 1762, late in the
Seven Years' War, Ternay was chosen to lead a secret expedition against the British
Newfoundland Colony. With instructions to take and hold the colony, and possibly also make an attack on
Fortress Louisbourg, then in British hands, Ternay led a squadron of two ships of the line, one frigate, and two
flutes through the British blockade of the French coast from
Brest, France on 20 May 1762. Arriving at
Bay Bulls on 20 June, he landed 750 soldiers, led by Joseph-Louis-Bernard de Cléron d'Haussonville, who captured
St. John's without resistance from its small British garrison. Ternay then oversaw the destruction of St. John's
fishing stages and fishing fleet. British estimates of the damage caused by Ternay's squadron ran to £1 million. Although the French had not anticipated a British response until the next year, General
Sir Jeffery Amherst was alerted to the raid in July, and organized an expedition to recover Newfoundland. A British fleet arrived on 12 September, landing 1,500 troops the next day at
Torbay. Two days later the French troops had retreated into
Fort William after the
Battle of Signal Hill. In a council, Ternay advocated abandoning the position, but was apparently outvoted, with the council opting to leave the ground forces and some marines, but also making provision for their eventual recovery by the fleet after it left the harbour. However, given a favourable wind and foggy conditions, Ternay decided to depart that night, and slipped away, leaving the French army to surrender three days later. Ternay's return to France was difficult: he was forced to run from British ships to the Spanish port of
A Coruña, and only reached Brest in January 1763. Although criticised by d'Haussonville for abandoning him, Ternay's actions met with approval, since he had managed to save his fleet. ==War of American Independence==