South American border war fought between 5–31 July 1941 between Ecuador and Peru
A brief 1941 border war between Ecuador and Peru led to the Rio Protocol, though territorial disputes persisted for decades until 1998.
Key Facts
- War duration
- 5–31 July 1941
- Peruvian territory occupied
- Province of El Oro and parts of Loja
- Ceasefire date
- 31 July 1941
- Rio Protocol signed
- 29 January 1942
- Final border resolution
- Brasilia Presidential Act, October 1998
- Conflict sequence
- First of three 20th-century Ecuador–Peru military conflicts
By the Numbers
Location
Cause → Event → Consequence
Long-standing territorial disputes between Ecuador and Peru over their shared border region, particularly in the provinces of El Oro and Loja, created persistent tensions that ultimately erupted into open military conflict in 1941. Neither country received external support from Allied or Axis powers despite the concurrent World War II.
Between 5 and 31 July 1941, Peruvian forces invaded and occupied the western Ecuadorian province of El Oro and portions of the Andean province of Loja. A ceasefire was agreed on 31 July 1941, halting active hostilities after roughly three and a half weeks of fighting.
Both nations signed the Rio Protocol on 29 January 1942, leading to the withdrawal of Peruvian forces. However, the underlying territorial dispute was not fully resolved until the Cenepa War of 1995 and the subsequent Brasilia Presidential Act signed in October 1998, which finally settled the border.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Side B
1 belligerent