The family eventually fled to Madrid in July 1936. When the family arrived, the city was held by Republican forces who had withstood an attempted invasion from the Nationalists. In October, however, Nationalist forces decided to lay siege to the city and Julián was enlisted into the Republican reserve forces and led a mule team that transported supplies. Meanwhile, Bahamontes, along with his mother and sisters, escaped to the village of Villarrubia de Santiago due to the intensifying air raids in Madrid. They were joined by Julián after the war, but the family continued to struggle; as he had been with the Republicans, the losing side, Bahamontes' father received no pension and he was forced to break rocks for road construction in order to earn enough money for the family. The young Bahamontes resorted to theft in order to sustain himself and the family; he would jump into the trailers of lorries from a bridge over a road before filling a bag with food from the trailer. He also dug out live ammunition from civil war trenches to sell as scrap metal.