The Red Battalions were urban workers who were recruited by the Constitutionalist forces of the Mexican Revolution to fight against the Zapatistas and Pancho Villa's army.
The Mexican Revolution was a civil war that saw various alliances between different forces who fought various political reasons.
The battalions were deployed by Carranza in exchange for various rights for workers, to defeat the "peasant counterrevolutionaries" of Zapata and Villa.
The battalions were ultimately disbanded after Carranza no longer required their forces to subdue the insurgents of the north and the peasant guerrillas of the south.
On 13 January 1916, amidst strikes incited by the Casa Obrera Mundial, Carranza ordered the last of the Red Battalions to dissolve.