How is God’s wrath against his people described?

What was stated negatively at the end of the previous verse, You have not forgiven, is now stated directly: You have wrapped yourself with anger and pursued us, killing without pity. 

Anger depicts the righteous wrath of God which punishes the hardened sinner (see also Lamentations 2:1; Romans 1:18). In this wrapp[ing] in anger, anger is thought of as a garment in which God has clothed himself, so that he did not reveal himself to Israel other than in his anger. The people therefore also experienced and perceived nothing about God, except his anger and punishment.¹ They only saw him in his anger and not in his heart (see Lamentations 3:33). He pursued them and carried out a merciless slaughter among them (see also Lamentations 2:20–21).² God is presented as the pursuing avenger, who does not rest until he has retaliated. His divine vengeance consisted in killing without sparing (see also Lamentations 2:21). This worked out in the violence accompanied by the war against them.³