 Complete the following phrase:  With training underway, and the tanks quickly put into combat, the first 50 vehicles were organized into the Popular Armys first tank battalion. The battalion was equipped with three tank companies each company containing ten tanks and a headquarters company; each company had three platoons, with three tanks a piece, and a command tank. By mid-November a second battalion was organized. Later that month, Krivoshein and his deputy Major Greisser were recalled to the Soviet Union and replaced by General Dmitry Pavlov. In December 1936, General Pavlov organized new Soviet armored vehicles into an armored brigade, made up of four tank battalions and a reconnaissance company. This brigade, known as Brigada de Carros de Combate Tank Brigade, was composed of 56 tanks and 68 other armored vehicles, and immediately saw combat around Madrid, including in the battles of Jarama and 