Two days after another Geuzen army, under Jan Denys, had been defeated at Wattrelos by Maximilian Vilain, Philip of Niorcarmes, stadtholder of Hainaut, attacked a large force of Calvinists under Pierre Cornaille at Lannoy.

Both Denys and Cornaille had been moving to lift the Siege of Valenciennes.

Noircarmes fell on the Protestants and broke their formation in the first attack, after which the rest tried to flee.

According to Catholics 2,600 died,[1] however, La Barre recounted only “700 to 800 Huguenots” fallen.

[3] Still, this defeat was a heavy one for the South-Dutch rebels, many times heavier than Wattrelos.