- They played crucial roles ranging from governance and logistics to medical care and regulated prostitution.
- They formed itinerant family communities that, despite being restricted by military laws, were essential for the emotional and material support of soldiers.
- There are records of women who actively fought in battles, some disguised as men, demonstrating exceptional military courage.
When we think of the Spanish Tercios, the first image that comes to mind is that of compact blocks of soldiers with pikes and arquebuses, dominating the battlefields of Europe. However, behind this wall of steel, there existed a vibrant and diverse female universe that, although often ignored by traditional history books, was fundamental to the military machinery of the Hispanic Monarchy.
These women were not mere spectators; they formed what could be called a parallel army . From influential nobles and governors to washerwomen, prostitutes, and resilient wives, the female presence in the camps was so massive that it worried the military leadership, transforming the garrisons into veritable itinerant villages composed of entire families.
The diversity of roles in the camp

The social structure within the Tercios was complex. At the top, we find figures of power such as Isabel Clara Eugenia or Isabel de Bourbon , who exercised governing functions. But, in the day-to-day life of the marches, the reality was quite different. There were the so-called field followers , such as the famous Isabella de Luna, who accompanied troops to North Africa even before the formalization of the Genoese ordinances.
A large group consisted of public women, known by terms such as *metreas*, *maletas*, or *quiracas *. Prostitution was seen as a necessary evil to prevent greater abuses against the civilian population of conquered cities. Curiously, there were rules for this: the average was six women per company , although leaders like Archduke Albert tried to reduce this number, requiring them to disguise themselves as washerwomen to maintain an appearance of decency.
Domestic life amidst the chaos

Not all women were there professionally; many were wives facing extreme hardship. Marriage in the militia was viewed with reservations by the Crown, as there was no budget to support families nor adequate housing. However, the practice was common, and many soldiers entered into mixed marriages with Italian or Flemish noblewomen to try to climb the social ladder or obtain stability.
These wives were true women orchestras . They not only cared for the children and the food, but also worked as seamstresses, midwives, and tobacco sellers to supplement their income. The vivanderas , in particular, became iconic figures, supplying the lack of official provisions and selling food to soldiers along the Spanish Way. Life was hard: while the soldier received a full ration, the women and boys received only half of the ration.
Courage and weapons: women fighters

Although the rear was their usual place, there were extraordinary cases of women taking up arms. In 1572, in the village of Weert, the wives of soldiers fought with the same boldness as their husbands . Another striking example is that of María de Montano, who during the expedition to Algiers in 1541, managed to organize and arm three hundred young men with pikes to repel a Moorish cavalry attack.
History also holds the legend of María la Bailadora, who is said to have fought in the Battle of Lepanto using an arquebus with such skill that she impressed Don Juan of Austria, even securing an official position among the soldiers in Lope de Figueroa's regiment. These trajectories, often shrouded in male disguises—as in the case of Catalina de Erauso or Ana de Soto—show that the will to fight transcended the gender barriers of the time.
The dark side and oblivion
Forced cohabitation in hostile environments also led to tragedies. Memoirs from soldiers of the time, such as those of Alonso de Contreras, recount episodes of extreme domestic violence , including murders motivated by jealousy. Precarious conditions were the norm; Beatriz de Mendoza, despite having been the mistress of princes and having distributed provisions to soldiers in Maastricht, ended her days in utter poverty , dying in a stable on a pile of straw.
- Essential logistics: The women operated the supply, hygiene, and health network (nurses) in the field hospitals.
- Demographic impact: In certain garrisons, such as Bolduque, the female and child civilian population almost equaled the number of combatants.
- Military regulation: Philip IV went so far as to limit marriage licenses to just one-sixth of the unit to avoid riots and excessive spending.
The journey of these women in the Terços is a story of survival, resilience, and, at times, anonymous heroism. They transformed military rigor into a space of human coexistence, facing hunger, syphilis, and violence, while ensuring that the Spanish war machine continued to function through invisible but indispensable work.