ORDER OF BATTLE // May 23, 1568
Battle of Heiligerlee
Estimated force strength by side, with confidence labels per surviving record.
Forces engaged
2 sides catalogued · combined 7,100 estimated
Dutch rebels
3,900
Medium-confidence figure
Spanish Empire
3,200
Medium-confidence figure
Battle context
The Battle of Heiligerlee, fought on 23 May 1568, is conventionally treated as the opening engagement of the Eighty Years' War, marking the first major armed confrontation between Dutch rebel forces and the Spanish Empire in what would become an eight-decade conflict over Dutch independence. The rebel army under Louis of Nassau and Adolf of Nassau outnumbered the Spanish imperial force under Johan de Ligne, fielding approximately 3,900 troops against 3,200. Beyond its symbolic place as the war's inaugural battle, the engagement's broader strategic significance within the conflict cannot be elaborated from the available record.
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