Battle of Campos de Álvarez

Monument erected on the site of the Battle of Campos de Álvarez, fought on 31 January 1852
Juan Manuel de Rosas and Ángel Pacheco, respectively, facilitated for the Empire of Brazil and for Urquiza the easy success they achieved in their triumphant march into the interior of Buenos Aires Province. Rosas referred all matters to Pacheco, and Pacheco, in turn, failed to take timely or effective action. One need only consider the decisive events that shaped the operations culminating in the Battle of Caseros.
A month before Oribe’s capitulation, Colonel Martiniano Chilavert submitted a memorandum to Rosas in which he presented numerous reasons and favourable prospects for having Oribe move to engage Urquiza and, at the same time, preparing an army to invade Brazil. Rosas approved the memorandum and said he would consult Pacheco—but meanwhile allowed Oribe’s army to be undermined.
When Urquiza was gathering his forces in Gualeguaychú, Chilavert again urged Rosas to defend the Paraná River line, offering to lead the defence himself. Rosas responded that he would consult Pacheco. Soon thereafter, Pascual Echagüe was forced to abandon Santa Fe. When Urquiza moved from Rosario and Pacheco ordered Lucio Norberto Mansilla to withdraw from positions along the Paraná, Mansilla assumed this was to reposition him with infantry and artillery to the northern front dominated by Lagos with 8,000 cavalry, in order to defend the line of the Arroyo del Medio. Pacheco would then reinforce him from Luján, and together they would present battle to Urquiza. In the event of defeat, they could retreat to the barracks at Santos Lugares. This strategy would also buy Rosas time to raise the southern campaign in a unified effort and place Urquiza in a critical position, encircled and cut off from his supply lines. Mansilla presented this logic to Rosas, who again directed him to consult with Pacheco. Urquiza then advanced his vanguard to the Arroyo del Medio.
When Urquiza reached that point, and Pacheco insisted that Hilario Lagos retreat to headquarters, Lagos protested to Rosas, stating that he and his soldiers were determined to stand and defend the invaded land. Rosas responded affirming his confidence in Lagos's patriotism and advised him to harmonise his actions with General Pacheco's orders.
There were moments when Rosas showed signs of reacting—particularly when he sensed the disorganisation of his forces. He summoned Major Antonino Reyes, commander at Santos Lugares, and spoke of convening a war council of senior officers. But the impulse passed quickly. It was Pacheco—his constant reliance on Pacheco—that caused him to waver. Still, he told Reyes: “I’ll need you by my side; we must urgently appoint someone to command your battalion, the coastal battalions, and other units that together would make up about 1,500 men with six artillery pieces.” Reyes proposed Colonel Pedro José Díaz, a seasoned officer residing in Buenos Aires since being captured at Quebracho Herrado (28 November 1840) with the last remnants of Lavalle’s infantry. Díaz responded: “Tell the Governor I appreciate the trust he places in me; though a 'Unitarian', I will fulfil my duty as a soldier under the orders of my country’s government.” This led to the formation of that infantry brigade—the only one that, alongside Chilavert’s renowned artillery, held fire until the very end against the imperial forces.
Pacheco’s decisions, however, consistently cleared the path for the allied advance. On 26 January, as the allies reached Arroyo del Gato and moved on to Laguna del Tigre (near Chivilcoy), he ordered all troops withdrawn from the “Guardia de Luján” (present-day Mercedes), leaving only 600 men under Colonel Lagos—the sole commander actively resisting the enemy. Yet on the 28th, Pacheco wrote to Lagos suggesting he proceed as he saw fit with his forces, referring vaguely to movements supposedly made on the night of the 26th. He claimed that Major Albornoz was withdrawn because Lagos’s division was strong enough on its own.
But Pacheco’s assumptions were false—no such movements had occurred. Moreover, he ordered the withdrawal of all reserves, leaving Lagos isolated with a small division facing the enemy. Lagos replied on 28 January:
“Colonel Lagos, sir, made no movement whatsoever with the divisions encamped at Arroyo de Balta on the night of the 26th. I was informed by Major Albornoz that Your Excellency had ordered the withdrawal of all forces from Guardia de Luján on that same day. If I have been forced to engage the enemy solely on their left flank, it was because I was reprimanded for advancing with my force to Laguna de las Toscas, which I calculated (correctly) would be the enemy’s route.”
At the same time, serious accusations circulated against General Pacheco—some alleged that between 26 and 27 January he had established secret contact with General Urquiza, even removing Colonel Bustos’s aides from the area around Luján to that end. Bustos relayed the matter to Rosas through Major Reyes. Rosas simply replied: “He’s mad, sir.” The same was said of a Justice of the Peace who travelled from his post to confirm the rumour, and even of a prominent member of the legislature who echoed the report: “He’s mad,” Rosas repeated.
The allied army advanced from Chivilcoy to Luján, arriving on the morning of 29 January. By the 30th, its vanguard was positioned at Campos de Álvarez, just over two leagues from some of Buenos Aires’ forward divisions, located along the left bank of the Río de las Conchas (today the Reconquista River), defending the Márquez Bridge. Pacheco had just crossed the bridge without issuing orders and took the road to his estancia at El Talar.
Upon hearing of the enemy’s approach, Rosas instructed Lagos to engage them in battle, assuring him that General Pacheco would defend the Márquez Bridge with superior forces. With his own division and those of Colonels Domingo Sosa and Ramón Bustos (son of the Córdoba caudillo Juan Bautista Bustos), Lagos gathered approximately 2,500 men. At dawn on 31 January, he organised three parallel columns, deployed light cavalry to the front, and advanced to confront the enemy.
The allied army had formed in an extended line on the left flank, matching Lagos’s direction. General Juan Pablo López held the left; Colonel Galarza commanded the Entre Ríos cavalry in the centre; Colonels Aguilar and Caraballo positioned their divisions on either side. The allied force numbered about 5,000. The elite Buenos Aires squadrons clashed with the seasoned cavalry of Entre Ríos. These initially wavered when Lagos personally led charges that earned him lasting renown in Argentine military history. But the allied regiments, reinforced by López’s timely support and flanking manoeuvres, overwhelmed Lagos’s inexperienced squadrons. He then regrouped his best troops, led a final charge to stall the enemy, and withdrew in good order to the Márquez Bridge, losing around 200 men—including Commander Marcos Rubio—and several officers, weapons, and horses.
Allied reports and General César Díaz’s “Unpublished Memoirs” (pp. 265–267) claimed Lagos had 6,000 of the finest cavalry, and inconsistently reported both a lack of resistance and 200 casualties among Lagos’s forces, while stating the allies lost only 26 men. General Díaz had no direct knowledge, as he was two leagues from the battlefield and only joined the allied vanguard the next day. It was assumed Lagos still commanded the same force with which he had withdrawn from the northern line, but in reality, at Álvarez he had:
His own division, militia from Bragado, and veteran detachments: 600 men
Sosa’s division: 1,300 men
Bustos’s division: 600 men
Echagüe’s and Cortina’s divisions did not participate. The bulk of Lagos’s Bragado division had been redirected by Pacheco across the Márquez Bridge.
Lagos expected to find Pacheco at the bridge with infantry and artillery, as instructed. But Pacheco was not there—he had left not a single man. Lagos requested orders, reporting he was still skirmishing with the enemy’s advance units. From Santos Lugares came the reply: “Hold your position.” On 11 February, the entire allied army assembled at Álvarez. Lagos informed Santos Lugares, and only late that day was he told that if the enemy attempted to cross the river, he should retreat to headquarters.
In this context, Pacheco resigned as General-in-Chief, stating Rosas was already at Santos Lugares in command of the army. Rosas took it as a personal blow. Showing the resignation to Major Reyes, he said: “Don’t you see, sir? Pacheco is mad, sir.” Yet, as Pacheco had informed all commanders of his resignation and urged them to report directly to Rosas, Rosas responded that he had “not accepted General Pacheco’s request; and given the importance of his role and his distinguished performance, the illustrious general continues in command.”
Rosas, however, flew into a rage when told Pacheco had failed to defend the Márquez Bridge with the troops withdrawn from Luján, as previously ordered: “It cannot be—surely the General Pacheco could not have disobeyed the orders of the Governor of the Province!” On the night of 31 January, Benjamín Victorica arrived at Santos Lugares on Pacheco’s behalf. Rosas dismissed him without hearing the message. The following afternoon, Pacheco himself arrived. Reyes announced him and returned to speak with Colonel Bustos. Moments later, both men were astonished to see Pacheco leave Rosas’s quarters, head down, without speaking, mount his horse, and ride to Witt’s estate, from where he witnessed the subsequent military events.
The victory at Álvarez was naturally celebrated in Urquiza’s camp and boosted allied morale. In light of the ease of their progress, they began to believe—perhaps rightly—that they would soon enter Buenos Aires with weapons in hand. In Rosas’s camp, although the defeat was keenly felt, it produced no outward sign. On the night of 1 February, some 400 men deserted from the allies and joined Santos Lugares, greeted by cheers from their former comrades.
Among the Buenos Aires population, strong support for Rosas persisted, rooted in a cultural loyalty reinforced by shared adversity and struggle. Many soldiers believed they were defending national honour against a foreign invasion. Was that merely poetic? Perhaps, but it was the poetry of honour—an inner truth resonating within individual conscience. The rural population saw only the astonishing fact of the Brazilian Empire’s invasion and rallied around Rosas as the personification of national salvation.
General César Díaz, commander of the eastern division of the allied army, observed:
“The people of Luján displayed the same studied indifference as those of Pergamino; and to the outward signs of sympathy for Rosas, they added actions clearly reflecting their sentiments. They exaggerated the size and quality of Rosas’s forces, recalled the many political storms he had weathered, and were convinced he would once again emerge victorious.”
Upon the full allied army’s arrival at Álvarez, Díaz recounts Urquiza’s thoughts:
“I went to visit the General and found him in the Major General’s tent. He spoke of the bitter disappointment in the spirit we had expected from Buenos Aires. Until then, we had not faced any resistance. The General said, ‘If it were not for my interest in promoting the Republic’s organisation, I should have remained allied to Rosas, for I am persuaded that he is a very popular man in this country.’”
And Díaz concludes:
“If Rosas was so publicly hated, or no longer feared, as was claimed, why did the people not seize this opportunity to realise their long-held desires? Why did they show such exaggerated zeal in defending their own servitude? From what I witnessed, I am deeply convinced that Rosas’s authority in 1852 was as strong—perhaps stronger—than it had been a decade earlier, and that neither popular submission nor confidence in his leadership had ever abandoned him.”
Sources:
César Díaz – Unpublished Memoirs – Adriano Díaz Publications – Buenos Aires (1878)
Efemérides – Patricios de Vuelta de Obligado
Portal: www.revisionistas.com.ar
Adolfo Saldías – Historia de la Confederación Argentina – Ed. El Ateneo, Buenos Aires (1951)
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