The Battle of Boca Teacapan was the result of a United States Navy boat expedition to destroy a Mexican pirate ship which was attacking targets in the Pacific Ocean. United States sailors and marines in several small boats pursued the pirates to the Boca Teacapan, in Sinaloa and up the Teacapan Estuary for forty-two miles over several days before defeating them at their hideout. The battle ended with the destruction of the pirate ship.