Commentaries:
Adam Clarke
Before and behind - It is probable that one of the armies was in the field, and the other in the city, when Joab arrived. When he fronted this army, the other appears to have issued from the city, and to have taken him in the rear; he was therefore obliged to divide his army as here mentioned; one part to face the Syrians commanded by himself, and the other to face the Ammonites commanded by his brother Abishai.
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