The Battle of Heiligerlee (Heiligerlee, Groningen, 23 May 1568) was fought between Dutch rebels and the Spanish army of Friesland. This was the first Dutch victory during the Eighty Years' War. The Groningen province of the Spanish Netherlands was invaded by an army consisting of 3,900 infantry led by Louis of Nassau and 200 cavalry led by Adolf of Nassau. Both were brothers of William I of Orange. The intention was to begin an armed uprising against the Spanish rulers of the Netherlands. The invading force however, did not capture any cities and was soon defeated at the Battle of Jemmingen.