Key Facts
- Campaign phase
- Second campaign of the Paraguayan War
- Duration
- 1865–1866
- Treaty signed
- Treaty of the Triple Alliance
- Concurrent operation
- Siege of Uruguaiana
- Outcome
- Paraguayan invasion repelled
Strategic Narrative Overview
Paraguayan forces seized the city of Corrientes and advanced through the province, opening a southern front in what became a multi-theatre conflict. The campaign unfolded concurrently with the Siege of Uruguaiana, stretching Paraguayan operational capacity. The allied nations — Argentina, Brazil, and Uruguay — mobilised to counter the invasion, progressively pushing Paraguayan forces back and consolidating a unified military response under the framework of the Triple Alliance.
01 / The Origins
Paraguay, already at war with the Empire of Brazil, escalated the conflict by invading Argentina's Corrientes Province in 1865. President Francisco Solano López ordered Paraguayan forces across the border, occupying the city of Corrientes and several other towns. This aggressive expansion into Argentine territory forced Argentina and Uruguay to align with Brazil, culminating in the signing of the Treaty of the Triple Alliance and a formal declaration of war against Paraguay.
03 / The Outcome
The Paraguayan invasion of Corrientes ultimately failed, with allied forces repelling the occupation and securing Argentine territory. The campaign's failure marked a strategic turning point: rather than knocking Argentina out of the conflict, Paraguay's aggression solidified the Triple Alliance coalition. This set the stage for the subsequent allied invasion of Paraguay itself in later campaigns of the broader Paraguayan War.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Side B
3 belligerents