The Battle of Aljubarrota took place on August 14, 1385, during the Portuguese Crisis of 1383-1385. It was a significant conflict between the forces of Portugal, led by King John I, and the invading army of Castile, commanded by King John I of Castile. The battle was fought near the town of Aljubarrota in central Portugal. The Portuguese army, despite being outnumbered, employed effective tactics and utilized the terrain to their advantage. The victory at Aljubarrota secured Portugal's independence and solidified the Aviz dynasty's rule, marking a crucial moment in the nation's history.