Lamentations 5:9 (ESV)

9 We get our bread at the peril of our lives, because of the sword in the wilderness.

In times of chaos, it was easy for desert nomads to enter Canaan and harvest its food for themselves (Judges 6:1–6; 2 Kings 13:21). They carried weapons and thus made it dangerous for inhabitants to go out in search of food. This was an additional threat that the Judeans were now facing.