“This, then, is how matters turned out with Nicanor. From that time on the city has been in the possession of the Hebrews. So I too will here end my story.”
This is a very personal remark by the biblical author. This is the end of the story of Nicanor, therefore the end of this story. This was the turning point. As far as this author knows, this was the day of independence, the defeat of Nicanor in 161 BCE. Jerusalem was then a Hebrew city from that time forward, at least until the writing of this author. This then seems like a story of Jewish or Jerusalem independence. What happened after this was not a concern of this author.