Armans' company had five T-26 tanks in operable condition. The day before (28 October 1936) Francoist cavalry and Panzer IA tanks from the 88th Tank Battalion met with Republican T-26 tanks. The Pz.IA proved to have insufficient armament when pitted against the T-26. The Krivoshein's tank group, consisting of 23 T-26 tanks and 9 armoured cars, attacked Francoists on 1 November 1936, supporting the main Republican column retreating to Madrid. The Krivoshein's tank group took part in the fighting for Torrejón de Velasco and Valdemoro on 4–5 November 1936, a counter-attack in the suburb of Cerro de los Ángeles on 13 November 1936, and in continuous fighting inside Madrid itself through the middle of December 1936. Soviet military personnel of Krivoshein's group returned to the USSR in the end of November 1936, except for some tankers from Pogodin's company, mechanics from Alcalá de Henares tank repair base and military instructors from the Archena training center. The 1st Republican Tank Brigade initially consisted of a tank battalion, a Spanish motorcycle company and a transport battalion. It was created in December 1936 on the delivery of about 100 Soviet tanks and military personnel under the command of Soviet brigade commander D. Pavlov at the Archena training center. The Soviet volunteer tank commanders and drivers sent to Spain were from the best tank units of the Red Army: the Mechanized Brigade (named after V. Volodarsky) from Peterhof, the 4th Separate Mechanized Brigade from Babruysk (commander – D. Pavlov), and the 1st Mechanized Corps named after K.B. Kalinovsky from Naro-Fominsk. The tank gunners were usually Spanish. The 1st Republican Tank Brigade (1.a Brigada Blindada) first saw action near Las Rosas and Majadahonda (north-west of Madrid) in the beginning of January 1937, supporting the 12th and 14th International Brigades. This action broke up the second Nationalist assault on Madrid. There were around 70 T-26s in the Republican Army in the beginning of 1937. In February 1937, company-sized detachments of the Tank Brigade participated in the Battle of Jarama. On 14 February 1937 the Tank Brigade, together with the 24th Infantry Brigade, took part in a counterattack and overcame a major Nationalist force, causing about 1000 Nationalist casualties. On 27 February 1937, the Tank Brigade launched five attacks on Nationalist positions without infantry support, but took heavy losses from anti-tank guns (35 to 40 percent of its tanks in some attacks). Nevertheless, the T-26 was used