 The European powers continued contending for the island of Gorée, until in 1677, France led by Jean II d'Estrées during the Franco-Dutch War (1672–1678) ended up in possession of the island, which it would keep for the next 300 years.In 1758 the French settlement was captured by a British expedition as part of the Seven Years' War, but was later returned to France in 1783, following French victory in the American Revolutionary War.The states of the Wolof and Sereer, neighbouring the two colonial outposts, were particularly involved with the slave trade, having strong military organizations geared to supplying slaves to the Europeans.