Adam Clarke on Lamentations 5:12

Princes are hanged up by their hand - It is very probable that this was a species of punishment. They were suspended from hooks in the wall by their hands till they died through torture and exhaustion. The body of Saul was fastened to the wall of Bethshan, probably in the same way; but his head had already been taken off. They were hung in this way that they might be devoured by the fowls of the air. It was a custom with the Persians after they had slain, strangled, or beheaded their enemies, to hang their bodies upon poles, or empale them. In this way they treated Histiaeus of Miletum, and Leonidas of Lacedaemon. See Herodot. lib. 6 c. 30, lib. 7 c. 238.