At the end of 1937 the unit, which was still attached to the 64th Division, participated in the Battle of Teruel. On December 16, it participated in the capture of , subsequently remaining as a support unit. On December 30 the nationalists launched a counteroffensive that sought to lift the siege of Teruel, attacking in the Campillo sector. The 81st Mixed Brigade fell back under enemy pressure, losing Campilo and causing a breach in the front that would also drag the 83rd MB into its retreat. After the republican conquest of the Teruel capital, the unit was located on the left flank of the front, where it saw no outstanding activity.