Among all the heroic achievements of Joab, the most remarkable is the taking of the Amalekite capital. For six months the flower of the Israelitish army, twelve thousand in number, under the leadership of Joab, had been besieging the capital city of the Amalekites without result. The soldiers made representations to their general, that it would be well for them to return home to their wives and children.
Joab urged that this not only would earn for them contempt and derision, but also would invite new danger. The heathen would be encouraged to unite against the Israelites. He proposed that they hurl him into the city by means of a sling, and then wait forty days. If at the end of this period they saw blood flow from the gates of the fortress, it should be a sign to them that he was still alive.