Argentine Civil War From 1814 onwards, Argentina faced on serious internal challenges, resulting from disagreements over the proper form of government. This resulted in a series of civil wars that destabilized the young nation.
End of the Anglo-French blockade A British-French alliance had stymied Argentine leader Juan Manuel de Rosas and his ally
Manuel Oribe from taking the Uruguayan capital of
Montevideo by blockading the Rio de la Plata. This began a
long and arduous siege. However, as Rosas consolidated his position in the interior, the Europeans began to doubt the ability of the defenders of Montevideo to resist the siege, and thus began a series of agreements, culminating in the end of the blockade in the
Arana–Southern Treaty. Emboldened, Rosas decided to tighten his grip on the city by outlawing any up to that point tolerated trade with the city, which angered those who relied on it, among them the governor of
Entre Rios,
Justo José de Urquiza.
Urquiza's pronunciamiento The treaty came as a lucky break for Rosas as he began to face down a new threat: the Empire of Brazil, who felt threatened by the leverage Rosas might have over them with control over Montevideo and Uruguay in general. Rosas sent Urquiza to study the front and make preparations for a war with Brazil. Instead, Urquiza, suspicious that the warmongering was a ploy to delay the writing of an Argentine constitution, began to make plans of his own and negotiated loans from the Brazilians when he decided to rebel. When he felt it was most opportune, he released a statement from
Concepción del Uruguay known as his
Pronuniciamiento, calling for the resignation of Rosas. He began gathering troops, approximately 10,000 horsemen in total before making his next move.
The Uruguay Campaign In a joint treaty with Brazil and the Montevideo government, Urquiza's Entre Rios government declared their intention to first expel Oribe from Uruguay and then establish free elections in Argentina. They also agreed to come to the others' defense if Rosas decided to declare war on them. With his allies in
Corrientes, Urquiza crossed into Uruguay while a Brazilian force invaded from north. Facing such overwhelming odds, Oribe did not put up a fight, and instead signed an agreement allowing him to extricate himself peacefully. The Brazilians imposed a harsh price on the Montevideo government for their help, annexing a northern strip of the nation and forcing them to declare Brazil the guarantor of Uruguayan independence.
The Grand Army's Campaign Finally, the allies turned on Rosas, declaring war on his government. In compliance with the treaty, Urquiza led a joint army and crossed
Morón creek, positioning his forces in
Monte Caseros. Rosas's response up to this point had been lethargic and overly cautious, and this time was no different. Leadership was confused as his appointed commander
Angel Pacheco resigned due to contradictory micromanagement and incompetence on Rosas's part. In the end, Rosas, an aging politician more suited to administration than warfare, decided to take personal command of the battle. Because he was not an experienced or skilled commander, he made no effort to scout for a good battle position, and simply waited for the allies to come to him. ==The battle==