Albert Barnes Commentary Lamentations 5:12

"Princes were hanged up by their hand: The faces of elders were not honored." — Lamentations 5:12 (ASV)

After the princes had been put to death, their bodies were hung up by the hand to expose them to public disgrace. Old age, likewise, no more shielded men from shameful treatment than the high rank of the princes. Such treatment of conquered enemies was not uncommon in ancient warfare.