Pharaoh's army was come forth— Zedekiah, contrary to the oath that he had taken to Nebuchadnezzar, made an alliance with the king of Egypt, and contracted with him for assistance against the king of Babylon; accordingly the king of Egypt sent an army to his relief, which obliged the Chaldeans to raise the siege of Jerusalem, in order to fight this Egyptian army. Calmet is of opinion, that the Pharaoh here mentioned was the Apries of Herodotus, called Hophra in Scripture. See ch. Jeremiah 44:30. Instead of They departed, we may read, They were forced to depart.
Related Commentaries of Jeremiah 37:5
Jeremiah 37:5
5 Then Pharaoh's army was come forth out of Egypt: and when the Chaldeans that besieged Jerusalem heard tidings of them, they departed from Jerusalem.