The Redoutable-class submarines were a group of 31 submarines built between 1924 and 1937 for the French Navy. Most of the class saw service during the Second World War. The class is also known in French as the Classe 1 500 tonnes, and they were designated as "First Class submarines", or "large submarine cruisers". They are known as the Redoutable class in reference to the lead boat Redoutable, in service from 1931 to 1942. The class is divided into two sub-class series, Type I, known as Le Redoutable and Type II, Pascal.

The Battle of Gabon, also called the Gabon Campaign, occurred in November 1940 during World War II. The battle resulted in forces under the orders of General de Gaulle taking the colony of Gabon and its capital, Libreville, from Vichy France, and the rallying of French Equatorial Africa to Free France.