The Battle of Sluys was a crucial naval confrontation during the early stages of the Hundred Years' War, occurring off the coast of Sluys, in present-day Belgium. King Edward III of England led his fleet personally in a strategic assault against the French navy, which had sought to dominate the shipping lanes across the English Channel. The English fleet capitalized on their knowledge of local waters and utilized a combination of longbows, supplemented by smaller, more maneuverable ships. This proved advantageous in a naval setting that favored rapid engagements.

The battle commenced with the English forces executing a surprise attack on the French, who were anchored and unprepared. The outcome was disastrous for the French, with over 200 vessels reportedly lost. The English fleet's victory not only obliterated a significant portion of the French naval capabilities but also bolstered English morale and strengthened King Edward III's claim to the French throne. The control of the Channel became imperative for further military operations and the protection of trade routes.

The aftermath of the battle had far-reaching implications, shifting naval power in favor of the English and diminishing French dominance at sea. Control over the Channel facilitated the English supply lines and troop movements, making subsequent engagements throughout the Hundred Years' War more favorable for the English crown. Ultimately, this victory at Sluys marked a pivotal moment in the ongoing conflict between England and France, reinforcing the significance of naval warfare in medieval military strategies.