Tercios in the context of Mercenary

A pike is a long thrusting spear formerly used in European warfare from the Late Middle Ages and most of the early modern period, and wielded by foot soldiers deployed in pike square formation, until it was largely replaced by bayonet-equipped muskets. The pike was particularly well known as the primary weapon of Spanish tercios, Swiss mercenaries, German Landsknecht units and French sans-culottes. A similar weapon, the sarissa, had been used in antiquity by Alexander the Great's Macedonian phalanx infantry.

The Army of Flanders (Spanish: Ejército de Flandes; Dutch: Leger van Vlaanderen) was a field army of the Spanish Army based in the Spanish Netherlands between the 16th and 18th centuries. It was one of the longest-serving field armies of the early modern era, being founded in 1567 and disbanded in 1706. Taking part in numerous battles of the Eighty Years' War and Thirty Years' War, it employed or pioneered many developing military concepts, including permanent units (tercios), barracks and military hospitals long before they were adopted in most of Europe. As a result, the Army of Flanders has been considered the world's de facto first modern professional standing army. Sustained at huge cost and at significant distances from Spain via the Spanish Road, the Army of Flanders also became infamous for successive mutinies and its ill-disciplined activity on and off the battlefield, including the sack of Antwerp in 1576.

The siege of Castelnuovo was an engagement during the Ottoman-Habsburg struggle for control of the Mediterranean, which took place in July 1539 at the walled town of Castelnuovo, present-day Herceg Novi, Montenegro. Castelnuovo had been conquered by elements of various Spanish tercios the year before during the failed campaign of the Holy League against the Ottoman Empire in Eastern Mediterranean waters. The walled town was besieged by land and sea by a powerful Ottoman army under Hayreddin Barbarossa, who offered an honourable surrender to the defenders. These terms were rejected by the Spanish commanding officer Francisco de Sarmiento and his captains even though they knew that the Holy League's fleet, defeated at the Battle of Preveza, could not relieve them. During the siege, Barbarossa's army suffered heavy losses due to the stubborn resistance of Sarmiento's men. Even the Venetian refused the promised naval link to Castelnuovo with the supplies and reinforcements; after a general troop parliament, the commanding officer Francisco de Sarmiento asked his captains what his answer should be to Barbarossa's offer to surrender. The captains responded: "Que vengan cuando quieran" (Let them come whenever they want). However, Castelnuovo eventually fell into Ottoman hands and almost all the Spanish defenders, including Sarmiento, were killed. The loss of the town ended the Christian attempt to regain control of the Eastern Mediterranean. The courage displayed by the Old Tercio of Naples during this last stand, however, was praised and admired throughout Europe and was the subject of numerous poems and songs.

49°55′10″N 4°31′40″E / 49.91944°N 4.52778°E / 49.91944; 4.52778

The Battle of Rocroi, fought on 19 May 1643, was a major engagement of the Thirty Years' War between a French army, led by the 21-year-old Duke of Enghien (later known as the Great Condé) and Spanish forces under General Francisco de Melo only five days after the accession of Louis XIV to the throne of France after his father's death. Rocroi shattered the myth of invincibility of the Spanish tercios, the pike and shot infantry units that had dominated European battlefields for the previous 120 years. The battle is therefore often considered to mark the end of Spanish military greatness and the beginning of French hegemony in Europe during the 17th century. After Rocroi, the Spanish progressively transformed the tercio system incorporating more of the line infantry doctrine used by the French over time.