The Anniversary of the Battle of Rivas is observed on April 11 each year, also known as Juan Santamaria Day, in Costa Rica. This day commemorates the pivotal battle against Nicaragua's filibuster army, highlighting the bravery of 19-year-old Juan Santamaria, who sacrificed his life to ignite the enemy's citadel. The battle is significant for its role in shaping Costa Rica’s national identity. Celebrations typically include national parades and performances that honor Santamaria's courage. The battle itself took place in the Nicaraguan city of Rivas, where Costa Rican forces, under the command of General Cañas, achieved victory against William Walker's troops. Santamaria's actions during the battle are remembered as a crucial turning point in the conflict.