[2] Command of the brigade fell to Máximo Franco Cavero,[3] with Ramón de la Torre Martín as Chief of Staff and the anarcho-syndicalist Manuel Lozano Guillén as political commissioner.

[n. 1] During the Battle of Teruel, while the 125th and 126th mixed brigades participated in the fighting, the 127th MB remained located in Upper Aragón as a reserve force for the Eastern Army.

On March 13, it lost the towns of Andorra, Ariño and Alloza, having to retreat to the area between Teruel and Escorihuela, where it was located until April 23rd.

[10] In August 1938 it was sent as reinforcement to the Extremadura front, now under the command of the militia major Esteban Serra Colobrans.

In January 1939 it intervened in the Battle of Peñarroya, participating in the breakdown of the front and managing to advance to the Patuda and Trapera mountains.