island, 17th century Gennes was made chevalier of the
Order of Saint Louis. He was appointed
capitaine de vaisseau (
ship-of-the-line captain) in 1691, aged about 35. In 1695 Gennes was given command of a squadron of the king's navy armed by some private individuals who had obtained permission to make an establishment in the
Strait of Magellan, or near there in the north or south sea. Gennes left La Rochelle on 3 June 1695 in command of a fleet of five vessels, the largest being the
Faucon (46) and the ''Soleil d'Afrique'' (32). The fleet was at
Gorée off what is now
Senegal from 3–19 July 1695, and in the
Gambia River from 22 July to 24 August 1695, where the French captured Fort James on what is now
Kunta Kinteh Island from the English. Gennes loaded two vessels with the captured Africans he found in the English base and dispatched them to the French islands of the Antilles. This prize covered all the costs of the armament. Contrary winds forced the rest of the fleet back to Gorée on 5 September 1695. From there they sailed to the
Cape Verde Islands, to Saint Anne Island on the coast of Brazil and then to
Rio de Janeiro, which they reached on 2 December and left on 26 December 1695. The fleet sailed down the coast of
Patagonia in January 1696. They entered the Strait on 11 February 1696 and reached Port Galant, but were forced to return and reentered the Atlantic on 11 April 1696. Gennes blamed the captain of the
Séditieux for the failure to reach the Pacific. Although expedition was unable to pass through to the Pacific due to the extreme cold and poor weather, it made a number of observations of the land and inhabitants of the region. On 16 April 1696 the squadron was separated by fog. Gennes returned to Rio de Janeiro on 20 May. He rejoined the ''Soleil d'Afrique
and Séditieux'' (26) on 18 July 1696 in
Bahia. The squadron reached
Cayenne on 31 August 1696, left the next month to cruise around
Barbados, and visited
Martinique,
Saint Lucia and
Guadeloupe. Gennes sailed from Guadeloupe on 11 February 1697. He returned to La Rochelle on 21 April 1697. Gennes was granted considerable pensions for himself and his family, was given a large grant of land named Oyac on the mainland of
Cayenne, and was elevated by the king to become the count of Oyac. ==Governor of Saint-Christophe (1698–1702)==