Battle of Tuyutí

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Battle of Tuyutí

Date and place
- May 24, 1866, at Tuyutí, a swampy plain near the Paraná River in Paraguay.

What it was
- A major battle in the Paraguayan War. The Paraguayan army attacked the encamped Triple Alliance (Brazil, Argentina, and Uruguay). It is one of the bloodiest battles in South American history.

Belligerents and leaders
- Paraguay: commanded by Francisco Solano López with key generals Vicente Barrios, Isidoro Resquín, José Eduvigis Díaz, and Hilario Marcó.
- United Army (Allies): Brazil under Manuel Luís Osório, Argentina under Bartolomé Mitre, and Uruguay under Venancio Flores. Notable Brazilian artillery commander Emílio Mallet; Brigadeiro Antônio de Sampaio led infantry and died in combat.

Forces
- Paraguay about 26,000 soldiers.
- Allies about 35,000 soldiers (Brazil ~22,000; Argentina ~11,800; Uruguay ~1,200).

The battle
- The fight began around 11:55 a.m. with three Paraguayans columns attacking the Allied lines.
- The Paraguayan left nearly broke through toward the camp, but the defense held.
- A hidden ditch in front of the Brazilian artillery, known as the Fosso de Mallet, protected the guns and stopped the attack.
- Sampaio’s 3rd Infantry Division held firm and then the Allied reserves struck, driving back the Paraguayan center.
- In the Argentine sector, Paraguayan cavalry defeated the local Argentine riders but were ultimately repelled.
- By about 4 p.m., the Paraguayan assault collapsed and their army was virtually destroyed, though the Allies had suffered heavy casualties too.

Casualties and result
- Paraguay: around 6,000 killed and 7,000 wounded (about 13,000 total).
- Allies: about 996 killed and 3,232 wounded (around 4,200 total).
- Outcome: Allied victory. The Paraguayan offensive failed, and the Allied camp remained in place for months.

Aftermath
- The battle caused massive losses and disease also took many lives in the weeks that followed.
- It earned Brazil the nickname “The Battle of the Patrons” because leaders of the infantry, cavalry, and artillery fought there, and it is remembered for the death of Sampaio, a key infantry patron.
- Tuyutí remained a focal point for months, and Paraguay would launch another attack in November 1867 (the Second Battle of Tuyutí).