The Harriers column was another militia column organized by the Barcelona Libertarian Movement; the National Confederation of Labor (CNT), the Iberian Anarchist Federation (FAI) and Libertarian Youth (JL). It took shape in August 1936, one month after the military uprising in Barcelona. Other militia columns had already left, such as one of the PSUC, the Karl Marx column; another from POUM, the Lenin column; and three anarchist columns, the Durruti, the South Ebro and the Ascaso columns. But these columns stagnated throughout the month of August. This made it clear that they needed reinforcements, both in arms and in new militiamen. For this reason the Central Committee of Antifascist Militias, which was the body that was in charge of the war in Catalonia at that time, began to organize a new column.