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Brazilian minister José Antônio Saraiva was sent to Uruguay with a fleet of ships to demand compensation for damages caused to farmers in border conflicts.
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Paraguay invades Mato Grosso (Brazil). This event was referred to as the Mato Grosso campaign. Victor: Paraguay
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Brazil begins a siege of Montevideo, Uruguay.
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Following the presidency of Atanasio Aguirre,Tomás Villalba becomes 2nd interim president of Uruguay. After 5 days, Villalba gave up his seat to Venancio Flores.
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Paraguay now occupies part of Corrientes, Argentina.
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Triple Alliance Treaty is signed in Buenos Aires, by Brazil, Argentina, and Uruguay.
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Paraguay attempts to attack both Brazil and Argentina, but fails on both fronts, and retreats back to Paraguay.
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A series of attacks conducted by the Allies in Paraguay. The Allies won with the fall of the fortress of Humaitá.
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A brief campaign ending with the destruction of the Paraguayan army at the Battle of Lomas Valentinas. The president of Paraguay was involved in this battle, but escaped with his life.
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Attack on Paraguay in the Cordilleras Mountains. The Allies won, and Lopez (the president of Paraguay) was killed.
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