Sluys was decisive because of the capability France lost

Sluys did not end the Hundred Years War or permanently remove the threat of invasion, but its human losses were extraordinary for medieval France. The comparison with Trafalgar, Midway, Camperdown, and Quiberon Bay considers the people and core assets each battle removed. Sluys qualifies as decisive because it erased an exceptional concentration of experienced military manpower and altered France's ability to contest the next campaigns. Trained people mattered as much as lost hulls because France could not quickly replace the experience concentrated aboard the invasion fleet.