Festivities of invierno de Codo Activity · Codo, Campo de Belchite, Zaragoza Image of Codo, not of the place itself. Codo's winter festival is held in the village where, on 24 August 1937, the Tercio de Montserrat, a requeté unit made up mostly of Catalans, resisted the Republican advance towards Belchite and lost more than a hundred and forty of its roughly one hundred and eighty men. Photo: MaGrc (CC BY-SA 4.0) What to see and do in Codo