The Battle of Segre is the collective name of a series of battles that took place along the Segre River between 4 April 1938 and the 3 January 1939, during the Spanish Civil War after the Nationalist Faction had broken the lines of the Spanish Republican Army in the Aragon Offensive. Photographer Robert Capa took pictures of the Spanish Republican Navy Marines of the 151 Brigada Mixta who fought in this battle.