And, behold, as Barak pursued Sisera, Jael came out to meet him, and said unto him, Come, and I will show you the man whom you seek. And when he came into her tent, behold, Sisera lay dead, and the peg was in his temples.
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Ambrose of Milan
So, then, Deborah foretold the event of the battle. Barak, as he was bidden, led forth the army; Jael carried off the triumph, for the prophecy of Deborah fought for her, who in a mystery revealed to us the rising of the church from among the Gentiles, for whom should be found a triumph over Sisera, that is, over the powers opposed to her. For us, then, the oracles of the prophets fought, for us those judgments and arms of the prophets won the victory. And for this reason it was not the people of the Jews but Jael who gained the victory over the enemy. Unhappy, then, was that people which could not follow up by the virtue of faith the enemy, whom it had put to flight. And so by their fault salvation came to the Gentiles; by Jewish sluggishness the victory was reserved for us.
Jael then destroyed Sisera, whom however the band of Jewish veterans had put to flight under their brilliant leader, for this is the interpretation of the name of Barak; for often, as we read, the sayings and meri...
We read that when God wished it clearly understood that great deeds were done by him, they were done through a few or through the lowliest, lest the work of his heavenly hand be attributed to human strength. In this way the leader Sisera, before whom the Hebrew army trembled, was laid low by a woman. - "The Governance of God 7.8"