Alessandro Farnese Duke of Parma

Farnese led Spanish forces in a successful siege of Maastricht, a key rebel stronghold. The city was stormed after a brutal four-month siege, and its defenders were massacred, demonstrating Farnese's military effectiveness.

Farnese captured Antwerp, the largest city in the Netherlands, after a year-long siege. He constructed a bridge of boats across the Scheldt River to blockade the city, forcing its surrender and splitting the rebel provinces.

Through a series of campaigns, Farnese reconquered the southern provinces of the Netherlands (modern-day Belgium) for Spain. This established the basis for the later split between the Dutch Republic and the Spanish Netherlands.

Farnese led a Spanish army into France to support the Catholic League against Henry of Navarre. He relieved the Siege of Paris and later the Siege of Rouen, but his campaigns were hampered by supply issues and political constraints.