Why were the nazis ultimately defeated in stalingrad?

the soviet soldiers had better military training.

the soviet soldiers had better access to armored vehicles.

the nazi soldiers were being led by inexperienced leaders.

the nazi soldiers were not prepared for the cold russian winters.

The Soviet soldiers defended their motherland.

Explanation:

When a person struggles for his own land he doesn't think of his life.

It was a victory of spirit over matter. For the Soviet people it was the Great Patriotic War. Not only soldiers defended the country,  but every person, including old people and children.

b

Explanation:

The soviets had made new weapons and vehicles in their factory and when they came to attack the Nazis they were surprised that soviets' had now new reinforced   planes and vehicles which made them retreat.