At his right hand was the divination for Jerusalem, to appoint captains, to open the mouth in the slaughter, to lift up the voice with shouting, to set battering rams against the gates, to cast up a siege mound, and to build a wall.
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George Leo Haydock
Right of one going by Thapsacus and Damascus, and not through the Desert Arabia, for thus Rabbath would have been to the right. God permitted this divination to succeed in his wrath. The devil pushed the Chaldeans forward, lest the Jews might be converted. (Calmet)
If they had attacked Rabbath first, they would probably have succeeded, as they did five years after. But the time of vengeance was come for Jerusalem, (Haydock) and they were directed to assault it. (Worthington)
Voice: the din of war, (Haydock) or of soldiers, trumpets