The Battle of Kallo was a major battle of the Eighty Years' War. It was fought on 20 June of 1638 near the fort of Kallo, located on the left bank of the Scheldt river, between a Dutch army under the command of William of Nassau-Hilchenbach, and a Spanish army led by the Cardinal-Infante Ferdinand, governor of the Spanish Netherlands. As the Dutch approached with the aim of surrounding the city of Antwerp, the Cardinal-Infante managed to assemble an army and almost miraculously repelled the much larger Dutch force, which lost several hundred men dead (one of whom was William of Nassau's only son), another 2,500 taken prisoner, and significant amounts of artillery and baggage.