Jerusalem is seized and captured, Jeremiah is captured then given choice to stay or be exiled by captain of the bodyguard Nebuzaradan, under appointed Babylonian king Gedaliah.
The fall of Jerusalem is told under king Zedekiah, he did evil in the sight of the Lord this is Jeremiah's grandson. Riblah from Babylon killed his sons in front of his eyes and took all the valuables from the temple to Babylon.
Isaiah wrote a message to the people of Israel and others regarding two kings of Israel who didn't trust God, to remind the people that God will ultimately deliver them through His warrior servant/king to come.
Jeremiah laments over the sins of Zion (Jerusalem) which has kindled the wrath of God as some of the horrors of the siege are described, ultimately the prophet hopes in the refuge of God's mercy.