Summary of the Book of Lamentations

The book contains five poems that depict the condition of the forsaken city of Jerusalem which had been burnt to the ground and utterly demolished by the Babylonians on the ninth of Av in the Jewish calendar in 586 BC, in contrast to the magnificent splendor that it once possessed. The reason for God's chastisement on the people of Judah and on the city of Jerusalem are spelled out in the form of an appeal made to God to remember the great suffering of his people and to take vengeance upon the conquerors of His city and the people of Judah.

Link: https://bible-history.com/old-testament/bookoflamentations