Indicate an event that was of great importance for raising the morale of the Soviet people?

Such an event could be the stoppage of the advance of the fascist troops in the Moscow region. Then the Soviet troops for the first time were able to push back the enemy. The next major victory was the Battle of Stalingrad. Thus, the morale of the troops increased significantly. Now it was no longer a question of how much land would have to be surrendered, but how many territories would be liberated from the Nazi occupation.