The Novgorod Chronicle presents the Mongol invasion as a punishment sent by God. The Mongols invaded because the princes were selfish and fought against one another, disobeying both their father and God. The Chroniclers write that the Devil himself is responsible for inciting this discord among the princes.
The Chronicle lessens the importance of the Mongol’s role in the invasion because God is named as the one pulling all of the strings. God allowed the Mongols attack as punishment for the people’s sins.… Read the rest here