Until mid-1937, it was part of the XV International Brigade. The Frenchman Gabriel Fort was its commander until 12 February 1937, when he was severely wounded during the Battle of Jarama, where the unit fought between 11 and 27 February. Then, the Romanian Émile Schneiberg took command until his death two days later in the same battle.[1]: 582 On 4 August 1937 it was moved to the XIV International Brigade, and comprised three companies of riflemen.[2]: 62 The 1st Company had a machine-gun section. Gabriel Fort was designated commander again on 7 August, but lost his vision in Villanueva de la Cañada during the following fights. It was part of the XIV International Brigade Bis between 27 September 1937 and 23 February 1938, but it belonged again to the XIV until its dissolution on 22 April 1938.[3]: 210