Maurice of Orange was stadtholder of all the provinces of the Dutch Republic except for Friesland from 1585 at the earliest until his death in 1625. Before he became Prince of Orange upon the death of his eldest half-brother Philip William in 1618, he was known as Maurice of Nassau.
The siege of Ostend was a three-year siege of the city of Ostend during the Eighty Years' War and the Anglo–Spanish War. A Spanish force under Archduke Albrecht besieged the fortress being held initially by a Dutch force which was reinforced by English troops under Francis Vere, who became the town's governor. It was said "the Spanish assailed the unassailable; the Dutch defended the indefensible." The commitment of both sides in the dispute over the only Dutch-ruled area in the province of Flanders, made the campaign continue for more than any other during the war. This resulted in one of the longest and bloodiest sieges in world history: more than 100,000 people were killed, wounded, or succumbed to disease during the siege.
The siege of Groenlo was a siege of Groenlo during the Eighty Years' War and the Anglo–Spanish War by a Dutch and English army led by Maurice of Nassau after it had followed an unsuccessful siege by Maurice in 1595.
The siege of Jülich was a major operation in the second phase of the Eighty Years' War that took place from 5 September 1621 to 3 February 1622. A few months after the Twelve Years' Truce between the Dutch Republic and the Spanish Monarchy expired, the Spanish Army of Flanders, led by the Genoese nobleman Ambrogio Spinola, went on the offensive against the Republic and approached the Rhine river to mask its true intentions: laying siege to the town of Jülich, which the Dutch States Army had occupied in 1610 during the War of the Jülich Succession. Although the capture of the town would not allow for a Spanish invasion of the Republic, its location between the Rhine and Meuse rivers rendered it strategically significant for both sides, given that the United Provinces greatly benefited from the river trade with the neighboring neutral states and Spain was pursuing a strategy of blockading the waterways which flowed across the Republic to ruin its economy.
The siege of Aachen took place in 24 August 1614, when the Spanish Army of Flanders, led by Ambrogio Spinola, 1st Marquis of the Balbases, marched from Maastricht to Germany to support Wolfgang Wilhelm, Count Palatine of Neuburg, during the War of the Jülich Succession. Despite its status as a free imperial city, Aachen was under the protection of John Sigismund of Brandenburg, Neunburg's ally, and then rival, in the battle for the United Duchies of Jülich-Cleves-Berg. In 1611, the Protestant population of Aachen had revolted against the Catholic city council and had seized power. When the Holy Roman Emperor Rudolf II, observing the Peace of Augsburg, had ordered the previous state to be restored, the Protestants had allied themselves with the Margraviate of Brandenburg. The unexpected arrival of a Spanish army at the gates of the city, however, caused the Protestants to lose courage and surrender Aachen to Spinola. A Catholic garrison was installed and a process of re-Catholicization began.
The siege of Lingen took place during the Eighty Years' War and the Anglo–Spanish War by a Dutch and English army led by Maurice of Orange. Frederik van den Bergh defended Lingen for Philip II of Spain which was besieged from 25 October 1597. After a siege of more than two weeks, Van den Bergh surrendered on 12 November 1597. The siege was part of Maurice's successful 1597 campaign against the Spaniards.
The capture of Enschede took place during the Eighty Years' War and the Anglo–Spanish War on 18 and 19 October 1597. A Dutch and English army led by Maurice of Orange took the city after a very short siege and threatening that they would destroy the city. The siege was part of Maurice's campaign of 1597, a successful offensive against the Spaniards during what the Dutch call the Ten Glory Years.
The siege of Oldenzaal was a short siege that took place during the Eighty Years' War and the Anglo–Spanish War by a Dutch and English army led by Maurice of Orange of the city of Oldenzaal from 20 to 23 October 1597. The city surrendered to the overwhelming Dutch and English force. The siege was part of Maurice's campaign of 1597 known as the Ten Glory Years, his highly successful offensive against the Spaniards.
The siege of Meurs took place between 29 August to 3 September 1597 during the Eighty Years' War and the Anglo–Spanish War. The Spanish occupied city of Moers under Governor Andrés de Miranda was besieged by Dutch and English troops under the command of Prince Maurice of Orange. The siege ended with the capitulation and the withdrawal of the Spanish garrison. The siege was part of Maurice's campaign of 1597 known as the Ten Glory Years, his highly successful offensive against the Spaniards.
The siege of Rheinberg took place from the 9 to 19 August 1597 during the Eighty Years' War and the Anglo–Spanish War by a Dutch and English army led by Maurice of Orange. The siege ended with the capitulation and the withdrawal of the Spanish after much unrest in the garrison. The liberation of the city of Rheinberg was the commencement of Maurice's campaign of 1597, a successful offensive against the Spaniards during the period known as the Ten Glory Years.
The Capture of Ootmarsum in 1597 was a short siege, that took place during the Eighty Years' War and the Anglo–Spanish War by a Dutch and English army led by Count Van Duivenvoorde while Maurice of Nassau was besieging Oldenzaal. The siege lasted from 19 to 21 October, where the Spanish garrison of Ootmarsum under the governor, Otto Van Den Sande, surrendered and was then occupied by the besiegers. The siege was part of Maurice's successful offensive against the Spaniards during the same year.
The siege of 's-Hertogenbosch of 1601(Sitio de Bolduque de 1601 in Spanish) was an unsuccessful Dutch attempt led by Prince Maurice of Nassau and William Louis of Nassau-Dillenburg to capture the city of 's-Hertogenbosch, North Brabant, Spanish Netherlands, garrisoned by about 1,500–2,000 Spanish soldiers led by Governor Anthonie Schetz, Baron of Grobbendonck, between 1 and 27 November 1601, during the Eighty Years' War and the Anglo-Spanish War (1585–1604), in the context of the long and bloodiest siege of Ostend.
The siege of Rees of 1599, also known as the relief of Rees, was an unsuccessful attempt by Protestant-German forces led by Count Simon VI of Lippe, and Anglo-Dutch forces sent by Prince Maurice of Nassau, commanded by Philip of Hohenlohe-Neuenstein and the Count Ernst of Solms, to capture the strategic stronghold of Rees, Lower Rhine, Duchy of Cleves from the Spanish forces of Don Francisco de Mendoza, Admiral of Aragon, second-in-command of the Army of Flanders, and Governor Don Ramiro de Guzmán, between 10–12 September 1599, during the Eighty Years' War and the Anglo-Spanish War (1585–1604). This Spanish victory was part of the campaign of Francisco de Mendoza and Cardinal Andrew of Austria of 1598-1599, also called the Spanish Winter of 1598-99.
The siege of Sluis (1604), also known as the Sluis campaign or the Battle of the Oostburg Line, was a series of military actions that took place during the Eighty Years' War and the Anglo–Spanish War from 19 May to 19 August 1604. A States and English army under Prince Maurice of Orange and Horace Vere respectively crossed the Scheldt estuary and advanced on land taking Cadzand, Aardenburg, and IJzendijke in the Spanish Netherlands. This soon led to the culmination of the siege of the Spanish-held inland port of Sluis.
The siege of Hulst of 1596 took place between mid-July and August 18, 1596, at the city of Hulst, Province of Zeeland, Low Countries, during the Eighty Years' War, the Anglo-Spanish War (1585–1604). The siege was won by the Spanish forces of the Archduke of Austria. After a short siege, during which Maurice of Orange launched a failed attempt to relieve the city, the garrison of Dutch and English troops fell into Spanish hands on August 18, 1596.
The siege of Grave was a siege that took place between 18 July and 20 September 1602, as part of the Eighty Years' War and the Anglo–Spanish War. The Spanish-held city of Grave was besieged by a Dutch and English army led by Maurice of Orange and Francis Vere respectively. After a siege of nearly two months the city surrendered when a Spanish relief army under Francisco de Mendoza was defeated just outside the city by the besiegers. The defeat was severe enough to cause a major mutiny in the Spanish army.
The siege of Rheinberg, also known as the Rhine campaign of 1601, was the siege of the towns of Rheinberg and Meurs from 12 June to 2 August 1601 during the Eighty Years' War and the Anglo–Spanish War. Maurice of Orange with an Anglo-Dutch army besieged the Spanish-held cities in part to distract them before their impending siege at Ostend. Rheinberg, an important city, eventually capitulated on 28 July after a Spanish relief force under Herman van den Bergh failed to relieve the city. The towns of Meurs surrendered soon after.
The siege of San Andreas also known as the siege of Sint-Andries was a military event that took place during the Eighty Years' War and the Anglo–Spanish War from 28 January to 6 March 1600. The Spanish garrison of San Andreas was besieged by an Anglo-Dutch force led by Maurice of Nassau. A Spanish relief force under the command of Luis de Velasco failed to relieve the fort after having been turned back by the besiegers. The fort surrendered after the garrison mutinied and accepted payment from Maurice.
The siege of Oldenzaal took place in the Spanish held town of Oldenzaal in the Twente region from July 23 to August 1, 1626 during the Eighty Years' War and the Anglo–Spanish War. After an eight-day siege led by Ernest Casimir the city surrendered.
The years 1599–1609 constituted a phase of in the Eighty Years' War between the Spanish Empire and the emerging Dutch Republic. It followed the Ten Years (1588–1598) that saw significant conquests by the Dutch States Army under the leadership of stadtholders Maurice of Nassau and William Louis of Nassau-Dillenburg, and ended with the conclusion of the Twelve Years' Truce (1609–1621) on 9 April 1609. The 1599–1609 period was generally marked by a stalemate; the well-known Battle of Nieuwpoort (1600) brought the Dutch a tactical victory without long-term gain, while Spanish conquests in the Siege of Ostend (1601–1604) and Spinola's 1605–1606 campaign were effectively balanced out by the Dutch naval triumph in the Battle of Gibraltar (1607) and the Spanish state bankruptcy that same year. Financial troubles were amongst the primary motives that prompted the Dutch, and even more so the Spanish, to head to the negotiating table for a ceasefire.
United Provinces 
Spain 
