A Four Day War Sparked By Soccer
The 1969 Football War between El Salvador and Honduras lasted only 100 hours. While often blamed on a tense World Cup qualifying match, the conflict was actually triggered by long-standing immigration and land disputes.
Tensions had been simmering for years due to thousands of Salvadoran migrants living and working in Honduras. When a series of soccer matches intensified the nationalistic anger, the sporting events became a catalyst for a full-scale military invasion. The conflict caused thousands of casualties and displaced many more people before an immediate ceasefire was brokered. Even though the war ended quickly, it had lasting political consequences for both nations and their future relations.
Source: Football War