For most of the war five International Brigades existed. These were the 11th, 12th, 13th, 14th and 15th Brigades. The other two brigades with international troops were the 129th and the 150th. The brigades were further organized into two international divisions, the 35th (including the 11th, 13th and 15th Brigades) and the 45th (including the 12th and 14th Brigades). Attempts were made to organise the Brigades into linguistically homogeneous units.
