In March 1938, after the start of the Aragon Offensive, it was assigned to the 24th Division and sent as reinforcement to the threatened sector; However, on March 11 the brigade withdrew from Pina until it reached Fraga, on the March 26. Some elements of the 140th Mixed Brigade participated in the defense of Lleida, but after the fall of the city they crossed the river and withdrew towards Llardecans. It was subjected to a reorganization, being added to the 44th Division.