The siege of Hulst (1645) was the last major siege of the Eighty Years' War. The heavily fortified town of Hulst was conquered by Dutch troops commanded by Frederick Henry after only 28 days. The Spanish were informed of the siege only two days before it started. The Spanish army compromised 2,500 infantrymen and 250 cavalry. The Dutch attacked with a force of 12,500 infantry, 2,500 cavalry and 20 pieces of artillery.