The Tank and Armoured Cars Group (Agrupación de carros de asalto y autos blindados in Spanish) was the first armoured formation of the Corps of Volunteer Troops (Corpo Truppe Volontarie, or CTV) involved in the Spanish Civil War. Between 3 February and 8 February 1937, Italian armour played a successful part during the Battle of Málaga. But, between 8 March and 23 March 1937, this group was involved in the Battle of Guadalajara which turned out to be a Republican victory.
Order of battle March 1937
Tank and Armoured Cars Group - Major Lohengrin Giraud
References
Tank and Armoured Cars Group Wikipedia(Text) CC BY-SA