And in time of peace there is no complaint, and no fault is found in this woman, whereas most of the judges were causes of no small sins to the people. But when the Canaanites, a people fierce in battle and rich in troops, successively joined them, showed a horrible disposition against the people of the Jews, this widow, before all others, made all the preparations for war. And to show that the needs of the household were not dependent on the public resources but rather that public duties were guided by the discipline of home life, she brings forth from her home her son as a leader of the army, that we may acknowledge that a widow can train a warrior; whom, as a mother, she taught, and, as judge, placed in command, as, being herself brave, she trained him, and, as a prophetess, sent to certain victory.
Source: Concerning Widows 8.43-46