The Mérida Offensive was one of the most significant military operations of the opening weeks of the Spanish Civil War. Between 2 and 11 August 1936, columns of the Army of Africa advanced north from Seville through western Extremadura, capturing a succession of towns before entering Mérida. Their success united the Nationalist-held territories of southern and western Spain, secured one of the most important road and rail junctions in the country, and opened the route towards Badajoz, Cáceres, and ultimately Madrid. The Nationalists already controlled much of north-western Spain and large parts of Andalucia, these territories remained separated by hundreds of kilometres of Republican-held land. Capturing Mérida offered the opportunity to link these isolated zones into a continuous front while simultaneously threatening the Republican position in Extremadura. Capturing the city would sever Republican communications across Extremadura, unite the Nationalist territories in the south and north-west, and provide a base for further operations against Badajoz and, eventually, Madrid.
During the early hours of 2 August 1936, the Army of Africa began leaving Seville, marking the start of the offensive into Extremadura. The columns travelled north along the main road towards Mérida, following a route of approximately 190 kilometres that passed through small farming communities, market towns, and the rugged hills of the Sierra Morena before emerging onto the plains of southern Extremadura. For many of the people living along the road, this was the first time they had seen such a large military force pass through their communities since the outbreak of the Civil War. The Army of Africa left Seville would spend its first day advancing through territory that had already fallen under Nationalist control following Queipo de Llano’s seizure of the province in July.
The first stage of the journey covered roughly 40km from Seville to El Ronquillo. Between these two points lay several small settlements, including El Garrobo, whose inhabitants watched the columns pass but saw no recorded fighting as Nationalist forces moved steadily north throughout the day, although little evidence survives describing the appearance of the convoy or the reaction of civilians in these villages. It is likely that hundreds of soldiers travelled in trucks and other requisitioned vehicles, accompanied by heavy weapons and artillery, but the surviving sources provide few detailed eyewitness descriptions of the advance itself. Only one body has been covered in the town, through since the Nationalist had overruled the area at the start of the uprising, there is no way to know how many were murdered in July or August.
The route crossed a number of bridges over the Rivera de Huelva and Republican forces attempted to delay the advance by damaging or destroying some bridges along the road. These demolitions did not halt the offensive, but they slowed the movement of vehicles and forced engineers and soldiers to carry out temporary repairs before the columns could continue. These delays provided Republican defenders further north with additional time to organise resistance around Santa Olalla del Cala and Monesterio.
Before the Army of Africa reached Santa Olalla del Cala, the town had remained under Republican control since the uprising in July. Situated approximately 75km northwest of Seville on the main road to Mérida, it formed the first Republican-held community on the Nationalists’ line of advance into Extremadura. With a population of 3,677, Santa Olalla occupied a strategic position on one of the principal routes connecting Andalusia with western Spain, although its military significance far exceeded its size. On 3 August, the leading elements of the Army of Africa entered the town and secured the town quickly and rapidly consolidated control, carrying out arrests against people associated with Republican political parties, trade unions, or local government. As elsewhere along the Army of Africa’s route, the military occupation marked the beginning of systematic repression intended to eliminate both actual and perceived political opponents.
The Andalusian Democratic Memory database has identified 55 victims from Santa Olalla del Cala, while documenting 59 people killed within the municipality, including several from neighbouring communities, but the number of those murdered could be as high as 500, and does not take into the account the women who had their heads shaved, poisoned with castor oil, paraded naked and pack raped. The municipal cemetery contains a documented fosa believed to hold at least 17 victims, 15 men and two women, nor the number imprisoned, though likely none were left to live. There are no surviving records of what happened, or images, and only exhumed body has ever been formally identified Five victims were removed privately by relatives in 190 after Franco’s death, without archaeological excavation or forensic recording, leaving uncertainty over ant original burial sites and the identities of those who remain. Democratic memory projects have documented but not identified in the cemetery fosa. As of 2025, descendants continued to search for those who disappeared following the occupation of the town. Given the occurrence of bodies being uncovered along main roads as they are expanded, the fates of the townspeople will remain only in family history.
As the Army of Africa was progressing, further troops, and local landowners and Falangists, who were able to operate as private armies, were fanning out from the route, to murder Republicans in surrounding areas. The town of Zufre, 15km west of Santa Olalla del Cala, suffered severe repression in August, but also suffers from a lack of formal evidence. Only two mass graves are officially documented, one in the town cemetery, with is formally marked and respected, and nine bodies of the presumed 42 have been exhumed over 2024 and 2025. Another town, a small of majestic location named El Real El Jara, just eight km from Santa Olalla del Cala, notes a location named Puerto Jabato, where a body was exhumed from between an oak tree and the road in the 1980s, and had been a fleeing ‘fugitive’ in the area. This kind of isolated burial site on private estates owned by the super wealthy is extremely uncommon and near impossible to map or monitor without surveillance completed by those who have inherited or purchased these estates from those who were the killers during the war.
Leaving Santa Olalla del Cala behind, the Army of Africa crossed the provincial boundary into Extremadura. The next objective was Monesterio, a town of approximately 6,000 inhabitants situated around 20km to the north. Positioned on the main highway between Seville and Mérida, Monesterio occupied one of the principal gateways into the province of Badajoz. Any Republican attempt to slow the Nationalist advance would almost inevitably be made there. News of the Army of Africa’s advance travelled ahead of the troops, allowing Republican authorities and militia to organise defensive positions and gather volunteers from the surrounding area. The defenders understood that if Monesterio fell, the road north towards Fuente de Cantos, Zafra, Almendralejo, and ultimately Mérida would lie open. Even so, they faced experienced professional soldiers supported by artillery, motor transport, and aircraft, while many Republican defenders possessed only limited transport and little more than hunting guns, ancient handguns, and knives.
CAROLINE ANGUS 