The Ben Ish Chai explains the accusatory angels by the passage Yomru hamoshlim bou cheshban, make an accounting of our deeds. What connection does it have to the city of Cheshban? The question is, how can we conquer Sichan when Maov was part of it? Once Sichan conquered Maov, Maov was absorbed in it and became null, a new nation. Similarly, when we do teshuva, we get transformed to a new person and the accusations don’t apply to us.
