San Jacinto Day is observed in Nicaragua every September 14, commemorating the Battle of San Jacinto, which took place in 1856 during the Filibuster War. This conflict involved a coalition of Central American armies fighting against American filibusters led by William Walker, who had usurped the presidency of Nicaragua. The battle, fought between Nicaraguan opposition troops under Colonel José Dolores Estrada and Walker's forces, resulted in a decisive victory for Estrada, helping Nicaragua re-establish its independence. San Jacinto Day is celebrated as a national holiday with colorful parades, award ceremonies, flag hoisting, and various festive events. Estrada is honored as a national hero, reflecting the significance of this victory in Nicaraguan history.