Examples of heroic fortress defenses have existed since ancient times, and this is not the most important thing in the victory over Nazism.
The Second world war, the war of engines, could not be won without industrial support for the heroism of people. In 1931, Stalin said: "We are 50-100 years behind the advanced capitalist countries, we have 10 years to reduce this gap, otherwise we will be crushed". In 1941, those, who were going to crush the USSR came. In ten years, thousands and thousands of large industrial enterprises were built.
But the most amazing thing was that far in the East of the country, beyond the Urals and in Siberia, the twin plant of the european territory plant was prepared, only concrete foundation, electricity supply and railway tracks. Can you imagine Ford building its factory in Detroit and just in case, its non working duplicate in Alaska?
When the war started and it started unsuccessfully, with defeats, in these hard conditions, sometimes under enemy fire, the factories were dismantled and transported to the east of the country, where in the harsh conditions of winter, they began to give the front products, sometimes even without walls and roofs over people's heads... 1500 of them! All this, the transportation of dismantled factories, in the conditions of war and defeat, given the enormous load for the railways, which had to work to the west, delivering products to the front and to the east, was impossible without A PLAN, a centralized plan. And of course, without the people, the titans, who were able to accomplish this feat... It was a really Great generation.