Bagbag Bridge located at Calumpit, Bulacan, was the site of the first battle between Filipino and American soldiers during the retreat of Aguinaldo to the Ilocos Region and of the longest battle during the Filipino-American Wars led by Gen. Gregorio del Pilar on April 25, 1899. The bridge commemorates the bravery displayed by the Filipinos as they victor in the battle against the American forces.
- "Things to Do and See in Bulacan." WOW Philippines. http://www.tourism.gov.ph/explore_phil/place_details.asp?content=thingstodo&province=10 (accessed on July 27, 2007)