Who saved Leningrad in 1941?

The blockade of Leningrad is associated with the hunger and sufferings of its inhabitants. Meanwhile, for three years under this city there was the greatest artillery duel in the history of mankind. The fundamental difference between the battle for Leningrad from all other battles on the eastern and western fronts is that the decisive contribution was made by heavy land and primarily marine artillery. Even under Stalingrad, Kursk and Berlin, the vast majority of the guns were field, and heavy artillery was used only episodically.
A lies repeated a thousand times, that the Finns did not fire the city, that the Finns did not have heavy artillery at all, that the battles near Leningrad ended in January 1944, etc., unfortunately, entered the official publications and school textbooks.
The author is not trying to polemize with liars, this is made by excerpts from dozens of secret documents given in the book