with great success during the Battle of Guadalajara in March 1937 after the 1st Tank Brigade was finally formed (its HQ was in Alcalá de Henares). For example, a platoon of two T-26 tanks under the command of Spaniard, E. Ferrera destroyed or damaged twenty-five Italian tankettes on 10 March 1937. In September/October 1937 the Republican 1st Tank Brigade was disbanded. Some volunteers returned to the USSR, while others joined with the International Tank Regiment under the command of Soviet major S.A. Kondratiev. From autumn 1937, all T-26 tank crews were Spanish. In summer 1938, the Republican Army had two armoured divisions, formed with Soviet help. Turrets from irreparable T-26 and BT-5 tanks and from BA-6 armoured cars were mounted on Chevrolet 1937s and other armoured cars developed and produced by the Republicans. Republican armour and infantry often suffered from cooperation problems throughout the war. T-26 tanks often attacked enemy trenches or defense positions in the narrow streets of Spanish towns without support, where they met strong resistance. Nationalist infantry, the Moroccans especially, defended courageously despite heavy casualties, throwing hand grenades and gasoline bombs, which are dangerous to tank engines. Ultimately, the Soviet Union provided a total of 281 T-26 mod. 1933 tanks, which were used by the Republicans in almost all the battles of the Spanish Civil War. Many sources state that a total of 297 T-26s were delivered to Spain but this probably includes the first planned delivery of 15 T-26s on 26 September 1936. Approximately 40 percent of T-26s fell into Nationalist hands by the end of the war, mostly after the defeat of the Republicans. In March 1937, a tank company of captured T-26 tanks was included into Panzergruppe Drohne, a tank unit of the German Condor Legion in Spain. The Nationalists prized the Soviet tanks, even offering a bounty of 500 pesetas for each tank captured intact. In August 1937, a reorganization of the Drohne Group into Spanish control started, which resulted in the formation of Bandera de Carros de Combate de la Legion, a part of the Spanish Foreign Legion, in March 1938. The Bandera consisted of two battalions (1. and 2. Agrupaciones de Carros). One was equipped with Panzer I tanks and the second with captured T-26 tanks. Approaching 1939, both battalions had similar organization, their third companies equipped with T-26 tanks. The Nationalists used captured T-26 tanks in the Battle of Teruel,