Trenches of the sierra and George Orwell's stay Historical milestone · Alcubierre, Los Monegros, Huesca George Orwell fought in the sierra of Alcubierre in January and February 1937, enlisted in the POUM militia, an experience he recounted in Homage to Catalonia. Bunkers, parapets and trenches of the front have been recovered and form the so-called Orwell Route. 1937 Photo: Medic-M (CC BY 4.0) What to see and do in Alcubierre