St Lucia in the late 18th century
The Windward islands were a target for European powers who wanted to govern them for commercial advantage.
Britain and France were at war from 1756-1763, initially in North America but then also in India and the conflict spilled over into the Caribbean. Both countries were looking to enlarge their influence, possessions and trading rights.
In 1762, Britain took control of St Lucia from the French but at the end of the war in 1763, a peace treaty returned St Lucia, Guadeloupe and Martinique to the French, while St Vincent would stay British, along with Grenada, Dominica and Tobago.
The island would see further spells of both British and French rule. This diagram showing the frequency with which St Lucia changed hands during the second half of the 18th century was prepared by Kate Astbury for the St Paul's Cathedral trail
War and resistance in the Caribbean: The monuments at St Paul's | St Paul's Cathedral
Saint Lucia 1762 1763
1778
1784
1794
1795
1796
1802
1803
It shows how complicated the history of St Lucia is for this period.
During the American revolutionary wars, Britain captured St Lucia and France retook Dominica and St Vincent in 1778 and 1779 but France regained control of St Lucia in 1784.
When war between Britain and Revolutionary France erupted in 1793, the overseas colonies belonging to Britain, France and their European allies, including the Caribbean, were also dragged into the war. St Lucia was a target for Britain and they reclaimed the island briefly in 1794 before gaining a stronger grasp of it in 1796 during Abercromby's campaigns in the Windward Islands. French revolutionary forces (made up of formerly enslaved Africans, free people of colour, indigenous peoples, white French and Creoles) were forced to surrender in May 1796 and 2000 prisoners of war were sent to Britain so that they were away from the field of war.

Map copyright National Archives of the UK
Although France would briefly claim the island in 1802, the defeat of the French forces at Fort Charlotte in 1796 effectively marked the end of St Lucia as French.