In 1390,
John of Bavaria, youngest son of Duke
Albert I, Duke of Bavaria only aged 17, had become Prince-Bishop of Liège, with the support of
Pope Boniface IX. His rule was a disaster. His authoritarian style clashed with the nobles and burghers of the Prince-Bishopric, who had acquired a certain degree of liberty over the years. He had already been expelled several times, when a new conflict in 1408 made him flee to Maastricht. Henry of Horne, Lord of Perwez was proclaimed Mambour and his son Prince-Bishop. John of Bavaria turned for help to his powerful family. John's brother was
William VI of Hainaut and his brother-in-law John the Fearless of Burgundy. Together with
William II, Marquis of Namur, they raised an army and marched against the citizens of Liège. Henri of Horne was aware that his troops were no match for the professional army heading his way, and therefore proposed to leave the city and start a guerilla war from the countryside. This was refused by the
hait-droits, the most radical part of the rebels. ==The battle==