From Hessians: Mercenaries, Rebels, and the War for British North America, by Brady J. Crytzer (Westholme, 2015), Kindle Loc. 1016-1023, 3715-3731:
What had begun as a sectional rebellion in North America had grown into a major geopolitical shift thanks in part to the inability of the king’s commanders to snuff out the revolution in its infant stages. While the capture and occupation of New York and Philadelphia had been major benchmarks of Howe’s tenure on the continent, Washington’s penchant for escape had allowed a supposedly containable problem to spread. The loss at Saratoga and the entry of France had helped to legitimize the rebel cause. Now, with Washington’s army rejuvenated at Valley Forge, the British would have to not only deal with his rebels but also focus their military efforts elsewhere. As the Americans had no navy to speak of initially, they could not pose any meaningful threat to Britain’s island holdings around the world; the arrival of France, however, suddenly had George III fighting a defensive war, on land and on the seas.
French policy makers treated the American rebellion as a proxy war, an analog to the great struggle for influence and colonial control that was the defining theme of European conflict of the eighteenth century. With that commencement of hostility the war that began as a colonial uprising transformed into a global affair. Fueled by Old World rivalries and longstanding animosity over decades-gone wars, the planet was divided into theaters of combat that extended far beyond the initial shots at Lexington Green. The still smoldering kindling of over six centuries of periodic conflict between Great Britain and France reignited in a blaze ranging from the Caribbean Sea and Central America to the subcontinent of India. The two world powers had each lain in wait with long-standing strategic objectives and contingencies in place for capturing high-value possessions of the other, and with the formal declaration of war it did not take long for them to go into motion. Already by the time that the Waldeckers sailed from New York in November, the British East India Company had successfully orchestrated a ten-week siege to capture the highly profitable French-controlled port of Pondicherry on India’s eastern coastline.
War had come, and the Caribbean was equally on notice. It did not take long for action to get under way, and for the French it began almost immediately. Situated in the heart of the Lesser Antilles the island of Dominica was a long-standing reminder of the lingering animosity of the Seven Years’ War. Originally a French colony, Dominica was captured in 1761, and by 1778 remained firmly in British hands; the fact that it was nestled between the French islands of Martinique to the south and Guadeloupe to the north made this especially insulting. Although it was a painful memento of their past defeat, for the French high command it was now serving as a practical thorn in their side as well. It was no secret that privateers often used the island’s ports as launching points to raid enemy shipping, and if Dominica could be captured it would take away Britain’s vital toehold in the area. Along with disabling Britain’s overall effectiveness, French policy makers believed that reclaiming the island would greatly improve communication between the two island colonies that it separated.