The Battle of Saint Cast occurred in the context of the Seven Years' War, a global conflict that erupted in 1756 and involved many of the great powers of the time. The British sought to weaken French naval dominance and secure strategic points along the French coast. The town of Saint Cast in Brittany became the focal point of these military ambitions. Admiral Sir Edward Hawke commanded the British fleet, comprising approximately 20 ships, intending to land troops and seize control of the region. On the other hand, French defenses were led by General François de Chevert, who had prepared the local forces to withstand such an assault.

As the British landed around Saint Cast, they were met with fierce resistance. The French troops, supported by local militias, utilized the natural landscape to fortify their positions and conduct a counter-offensive against the British. The battle saw intense fighting, as both sides vied for control of the strategic town. The French artillery was instrumental in inflicting significant casualties on the invading British forces, which led to their eventual withdrawal.

The outcome of the battle was significant in maintaining French control over its coastal territories during the war. Following the engagement, the British fleet retreated, and their attempt to establish a base in France was thwarted. This collective effort highlighted the organizational skills of the French military and the ability of local forces to rally in defense of their homeland against incursions from a powerful adversary.