In December 1937 - February 1938, the company fought for Sierra Quemado in a terrible blizzard: at an altitude of 2000 meters, they resisted the attacks during the Battles of Teruel. They managed to capture a large number of falangists' weapons: rifles, cannons, several armed trucks. The brothers Polycarp and Simon Krayevsky themselves smashed the machine gunners, destroying two squads and capturing their positions. In those battles, the company commander Tomashevich, political instructor Demyanchuk, sergeant Seradzky and Polikarp Kraevsky were killed.