Certain units of the People's Republican Army were entirely made up of "Carabineros", such as the 65th, 85th, 87th, 152nd, 179th, 211th, 222nd and 228th mixed brigades. The 3rd —the "Tercera Brigada Mixta" mentioned in the "Si me quieres escribir" song— and 5th were among the most distinguished mixed brigades of the loyalist army and saw action in most of the main battles of the civil war, including the Jarama, Brunete and the Teruel battles.